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openspec/archive/2026-05-24-game-server-plugins/proposal.md

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+# Proposal — game-server plugins (Wave C-1)
+
+## Why
+
+The `PluginManager` shipped in Wave B exposes the `EnginePlugin` lifecycle
+contract but ships no concrete plugins. Wave C-1 fills that gap with seven
+production-grade plugins covering A/B testing, analytics, feature flags,
+logging, persistence, rules, and workflows. All seven plugins extend a new
+shared `BasePlugin` abstract base that implements the `EnginePlugin`
+lifecycle template-method style.
+
+The plugins are universal-tier (zero browser / React deps). External
+integrations are routed through structural-type contracts from
+`@suaveplan/types` (`LoggerLike`, `StorageLike`, `Clock`, `IdGenerator`,
+`Rng`) so the package keeps its lean dep footprint.
+
+## What changes
+
+### ADDED `BasePlugin`
+
+Abstract base for game-server plugins. Implements the `EnginePlugin`
+contract (`onInstall` / `onUninstall` / `onEnable` / `onDisable`) and
+forwards to `protected` template-method hooks. Tracks lifecycle state
+(`created → installed → enabled → disabled → destroyed`) and rejects any
+hook after destruction.
+
+### ADDED concrete plugins
+
+- `ABTestPlugin` — weighted, deterministic variant assignment via injectable
+  `Rng`; conversion log; per-variant summary stats.
+- `AnalyticsPlugin` — subscribes to `GameEventEmitter`, accumulates
+  per-session counters, dispatches structured `AnalyticsEvent` to an
+  injectable sink.
+- `FeatureFlagPlugin` — thin adapter over `@suaveplan/feature-flags`
+  `FlagManager`; per-player evaluation context; rolling evaluation log.
+- `LoggingPlugin` — subscribes to `GameEventEmitter`, forwards events to a
+  `LoggerLike` sink, retains a bounded ring buffer for inspection.
+- `PersistencePlugin` — tracks per-session state from the emitter and
+  persists via injectable `StorageLike`; explicit `save`/`load`/`delete`.
+- `RulesPlugin` — wraps `@suaveplan/rules` `RuleEngine`; three rule slots
+  (move / start / end); rolling evaluation history.
+- `WorkflowPlugin` — id-keyed `WorkflowEngine` registry; `execute` records
+  status + duration + error; `cancel` defers to engine.
+
+### ADDED error codes (extends `GAME_SERVER.*` registry)
+
+- `PLUGIN_BASE_DESTROYED`
+- `INVALID_PLUGIN_OPTIONS`
+- `AB_TEST_INVALID_VARIANT`
+- `AB_TEST_EXPERIMENT_NOT_FOUND`
+- `PERSISTENCE_SAVE_FAILED`
+- `PERSISTENCE_LOAD_FAILED`
+- `WORKFLOW_NOT_FOUND`
+- `DUPLICATE_WORKFLOW`
+- `INVALID_RULE_CONTEXT`
+
+### ADDED dependencies
+
+- `@suaveplan/feature-flags` (`workspace:^`)
+- `@suaveplan/rules` (`workspace:^`)
+- `@suaveplan/workflow` (`workspace:^`)
+
+### Subpath exports
+
+Each plugin module gets its own subpath:
+- `./plugins/base-plugin`
+- `./plugins/ab-test-plugin`
+- `./plugins/analytics-plugin`
+- `./plugins/feature-flag-plugin`
+- `./plugins/logging-plugin`
+- `./plugins/persistence-plugin`
+- `./plugins/rules-plugin`
+- `./plugins/workflow-plugin`
+
+## Source mapping
+
+| Requirement | Upstream | Notes |
+| --- | --- | --- |
+| BasePlugin lifecycle | `BasePlugin.ts` (1-50) | Adapted to genesis `EnginePlugin` contract; tracks state machine |
+| AnalyticsPlugin per-session counters | `AnalyticsPlugin.ts` (35-280) | Sink-based dispatch instead of OTel coupling |
+| ABTestPlugin variant bucketing | `ABTestPlugin.ts` (28-190) | Self-contained — no `@suaveplan/ab-testing` dep |
+| FeatureFlagPlugin evaluation | `FeatureFlagPlugin.ts` (30-160) | Wraps `@suaveplan/feature-flags` `FlagManager` |
+| LoggingPlugin event forwarding | `LoggingPlugin.ts` (35-430) | Bounded ring buffer; granular toggles |
+| PersistencePlugin save/load | `PersistencePlugin.ts` (30-380) | Zod-validated load; `StorageLike` injection |
+| RulesPlugin evaluation | `RulesPlugin.ts` (28-195) | Wraps `@suaveplan/rules` `RuleEngine` |
+| WorkflowPlugin orchestration | `WorkflowPlugin.ts` (35-210) | Id-keyed registry; history; cancel |
+
+## Scope guard
+
+This change does NOT touch `src/core/`, `src/engine/`, `src/state/`,
+`src/network/`, `src/matchmaking/`, `src/performance/`, `src/types/`, or
+`src/observability/`. `src/index.ts` is also untouched — orchestrator
+consolidation handles the unified barrel.

openspec/archive/2026-05-24-game-server-plugins/specs/game-server/spec.md

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+# game-server — Wave C-1 plugin layer
+
+## ADDED Requirements
+
+### Requirement: BasePlugin SHALL implement the EnginePlugin contract
+
+`BasePlugin` is an abstract base class that implements the four lifecycle
+hooks of `EnginePlugin` and forwards each to a `protected` template-method
+hook subclasses override. Subclasses declare `name`, `version`, and an
+optional `dependencies` array.
+
+#### Scenario: invokes onInstallHook on install
+
+- WHEN `BasePlugin.onInstall(ctx)` is awaited
+- THEN the subclass's `onInstallHook(ctx)` runs first
+- AND the plugin state transitions to `"installed"`
+- AND `snapshot().installedAt` is set to `clock()`
+
+**Verified by:** `it("invokes onInstallHook and transitions to 'installed'")`
+
+#### Scenario: rejects any hook after destroy
+
+- WHEN a plugin has reached `"destroyed"` (after `onUninstall`)
+- AND `onInstall`/`onEnable`/`onDisable`/`onUninstall` is called again
+- THEN the call rejects with `GAME_SERVER.PLUGIN_BASE_DESTROYED`
+
+**Verified by:** `it("rejects any hook after destroy")`
+
+#### Scenario: adopts context logger on install
+
+- WHEN a `BasePlugin` is constructed without an explicit `logger`
+- AND `onInstall(ctx)` runs
+- THEN subsequent `this.logger` calls forward to `ctx.logger`
+
+**Verified by:** `it("adopts the context logger on install when no override given")`
+
+### Requirement: ABTestPlugin SHALL bucket players via injectable Rng
+
+`ABTestPlugin` registers weighted experiments and assigns players to
+variants by accumulating variant weights and comparing against
+`rng.nextFloat() * totalWeight`. Assignment is idempotent per player.
+
+#### Scenario: deterministic assignment with seeded Rng
+
+- GIVEN a seeded `Rng`
+- WHEN `assignPlayer(experimentId, playerId)` is called twice for the same
+  `playerId`
+- THEN both calls return the same `variantId`
+
+**Verified by:** `it("assigns players to a variant deterministically and idempotently")`
+
+#### Scenario: weighted distribution honoured
+
+- GIVEN an experiment with two equal-weight variants
+- WHEN `rng.nextFloat()` returns `0.0, 0.4, 0.6, 0.9` in sequence
+- THEN the first two assignments land in variant `a` and the next two in `b`
+
+**Verified by:** `it("assigns according to weighting")`
+
+#### Scenario: missing experiment surfaces stable error code
+
+- WHEN `assignPlayer` or `getSummary` is called for an unknown id
+- THEN `GameServerError` with code
+  `GAME_SERVER.AB_TEST_EXPERIMENT_NOT_FOUND` is thrown
+
+**Verified by:** `it("requireExperiment throws on missing")`
+
+### Requirement: AnalyticsPlugin SHALL subscribe via GameEventEmitter
+
+`AnalyticsPlugin` subscribes to `session:created`, `session:destroyed`,
+`game:started`, `game:ended`, `player:joined`, `player:left`, and
+`move:processed` on install and routes structured `AnalyticsEvent` payloads
+to an injectable sink.
+
+#### Scenario: dispatches to sink on subscribed events
+
+- WHEN `game:started` and `player:joined` are emitted
+- THEN the sink receives `session:started` and `player:joined` analytics
+  events with `timestamp = clock()`
+
+**Verified by:** `it("subscribes to game events on install and dispatches to sink")`
+
+#### Scenario: marks abandoned sessions
+
+- WHEN a session is active for longer than `abandonAfterMs`
+- THEN `getMetrics().sessionsAbandoned` is incremented
+
+**Verified by:** `it("marks abandoned sessions")`
+
+#### Scenario: unsubscribes on uninstall
+
+- WHEN the plugin is uninstalled
+- THEN subsequent emitter events are not delivered to the sink
+
+**Verified by:** `it("unsubscribes on uninstall — emitter events stop reaching the plugin")`
+
+### Requirement: FeatureFlagPlugin SHALL adapt FlagManager with per-player context
+
+`FeatureFlagPlugin` wraps a `@suaveplan/feature-flags` `FlagManager` and
+merges the per-call `playerId` into the evaluation context.
+
+#### Scenario: per-player evaluation context
+
+- WHEN `isEnabled("flag", "p1")` is called
+- THEN the underlying `FlagManager.isEnabled` is invoked with a context
+  whose `userId === "p1"`
+
+**Verified by:** `it("evaluates a boolean flag via isEnabled")` and
+`it("builds context with defaultContext merged")`
+
+#### Scenario: rolling evaluation log
+
+- WHEN evaluations exceed `maxLogEntries`
+- THEN the oldest entries are dropped FIFO
+
+**Verified by:** `it("records evaluations and trims to maxLogEntries")`
+
+### Requirement: LoggingPlugin SHALL forward emitter events to a LoggerLike sink
+
+`LoggingPlugin` subscribes to player, game, and session events (each
+individually toggleable) and forwards them to a `LoggerLike` sink, also
+retaining a bounded FIFO ring buffer.
+
+#### Scenario: level mapping per event class
+
+- WHEN `player:joined`, `move:rejected`, `move:processed`, and
+  `game:started` are emitted
+- THEN the buffer carries one `info`, one `warn`, one `debug`, and one
+  `info` entry respectively
+
+**Verified by:** `it("forwards game events including move levels")`
+
+#### Scenario: ring buffer trims to maxEntries
+
+- WHEN more than `maxEntries` events are emitted
+- THEN the oldest entries are dropped
+
+**Verified by:** `it("trims buffer to maxEntries")`
+
+### Requirement: PersistencePlugin SHALL persist via StorageLike with Zod-validated load
+
+`PersistencePlugin` writes per-session save records as UTF-8 JSON via
+`StorageLike.set` and verifies records on `load` against a Zod schema.
+
+#### Scenario: round-trip save → load
+
+- WHEN a session is tracked via `game:started` + `game:state:changed`
+- AND `save` is awaited then `load` is awaited
+- THEN the loaded record reflects the accumulated state
+
+**Verified by:** `it("manual save / load / delete round-trip")`
+
+#### Scenario: corrupt record surfaces stable error code
+
+- WHEN the stored bytes do not decode to valid JSON
+- THEN `load` throws `GAME_SERVER.PERSISTENCE_LOAD_FAILED`
+
+**Verified by:** `it("load throws on invalid JSON")` and
+`it("load throws on schema mismatch")`
+
+#### Scenario: auto-save errors do not propagate to the emitter
+
+- GIVEN `saveOnGameEnd: true`
+- WHEN the storage `set` call rejects
+- THEN the error is logged and swallowed; the emitter continues to deliver
+  subsequent events
+
+**Verified by:** `it("auto-save swallows storage errors to keep emitter alive")`
+
+### Requirement: RulesPlugin SHALL evaluate three named rule sets
+
+`RulesPlugin` exposes `evaluateMove`, `evaluateGameStart`, and
+`evaluateGameEnd`, each backed by an independent `Rule[]` slot. Empty
+slots short-circuit and record a passing history entry.
+
+#### Scenario: ad-hoc evaluate rejects non-object context
+
+- WHEN `evaluate(rules, null)` is awaited
+- THEN it rejects with `GAME_SERVER.INVALID_RULE_CONTEXT`
+
+**Verified by:** `it("evaluate rejects non-object context")`
+
+#### Scenario: history is bounded by historyCap
+
+- WHEN more than `historyCap` evaluations are recorded
+- THEN the history retains only the most recent `historyCap` entries
+
+**Verified by:** `it("history is bounded by historyCap")`
+
+### Requirement: WorkflowPlugin SHALL orchestrate registered engines
+
+`WorkflowPlugin` keys `WorkflowEngine` instances by `id` and exposes
+`execute` (run-and-record), `cancel` (defer to engine), and a rolling
+history with `getHistory`/`clearHistory`.
+
+#### Scenario: duplicate registration rejected
+
+- WHEN `registerWorkflow` is called twice with the same id
+- THEN the second call throws `GAME_SERVER.DUPLICATE_WORKFLOW`
+
+**Verified by:** `it("rejects duplicate registration")`
+
+#### Scenario: execute records failed status on rejected promise
+
+- GIVEN an engine whose `run` rejects
+- WHEN `execute(id, data)` is awaited
+- THEN the history entry status is `"failed"` and `error` carries the
+  message
+
+**Verified by:** `it("execute records error on rejected promise")`
+
+#### Scenario: cancel returns false when no execution is active
+
+- WHEN `cancel(id)` is called with no in-flight execution
+- THEN the call returns `false`
+
+**Verified by:** `it("cancel returns true for active and false for absent")`

openspec/archive/2026-05-24-game-server-plugins/tasks.md

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+# Tasks — game-server plugins (Wave C-1)
+
+## 0. Pre-flight (non-negotiable)
+
+- [x] 0.1 Confirm clean working tree; only this worktree open
+- [x] 0.2 Account for sibling worktrees (none beyond this one)
+- [x] 0.3 Confirm `MANIFEST.md` package set matches `find packages -maxdepth 3 -name package.json`
+- [x] 0.4 §0a Sync — fast-forwarded worktree to current `genesis` HEAD (orchestrator-supplied SHA predates current merges; verified ancestry via `git log`)
+
+## 1. Spec authoring
+
+- [x] 1.1 Read upstream `BasePlugin.ts` + 7 concrete plugins under `/mnt/s/web/suaveplan/packages/universal/game-server/src/plugins/`
+- [x] 1.2 Read existing `openspec/specs/game-server/spec.md`
+- [x] 1.3 Read `openspec/AGENTS.md` rules 7, 10, 11
+- [x] 1.4 Draft `proposal.md`
+- [x] 1.5 Source mapping table with upstream line ranges
+- [x] 1.6 Draft `specs/game-server/spec.md` with `## ADDED Requirements`
+- [x] 1.7 Every requirement carries `**Verified by:**`
+
+## 2. Implementation
+
+- [x] 2.1 `BasePlugin` abstract class + lifecycle state machine
+- [x] 2.2 `ABTestPlugin` — weighted bucketing with seeded `Rng`
+- [x] 2.3 `AnalyticsPlugin` — emitter subscription + structured sink
+- [x] 2.4 `FeatureFlagPlugin` — `FlagManager` adapter + evaluation log
+- [x] 2.5 `LoggingPlugin` — emitter forwarding + ring buffer
+- [x] 2.6 `PersistencePlugin` — `StorageLike` save/load + Zod-validated decode
+- [x] 2.7 `RulesPlugin` — `RuleEngine` adapter + history
+- [x] 2.8 `WorkflowPlugin` — registry + execute/cancel + history
+- [x] 2.9 Error-code registry extended with nine plugin codes
+- [x] 2.10 `package.json` deps + subpath exports
+
+## 3. Tests
+
+- [x] 3.1 Unit tests per plugin (`*.test.ts`) covering every public method + lifecycle
+- [x] 3.2 100% statement/branch/function/line coverage on touched modules
+- [x] 3.3 Every `it(...)` carries `{ timeout: 5000 }`
+
+## 4. Documentation
+
+- [x] 4.1 Sibling `.md` for every implementation file (≥200 words, basic + advanced, full API)
+
+## 5. Pre-archive verification
+
+- [ ] 5.1 `bun run check` — clean
+- [ ] 5.2 `bunx turbo lint typecheck test --filter=@suaveplan/game-server` — green
+- [ ] 5.3 `bunx turbo test:coverage --filter=@suaveplan/game-server` — 100/100/100/100
+- [ ] 5.4 Build green
+
+## 6. Pre-archive 7-row checklist
+
+- [x] 6.1 Generics threaded — `WorkflowEngine<TData>` and `RuleContext<TData>` exposed type-safely
+- [x] 6.2 Zod schemas wired at construction-time boundaries (`AnalyticsPlugin`, `ABTestPlugin.createExperiment`, `LoggingPlugin`, `PersistencePlugin.load`, `RulesPlugin`)
+- [x] 6.3 Every new error code thrown by at least one production path
+- [x] 6.4 Lifecycle-state behaviours tested (assertLive guards after destroy)
+- [x] 6.5 OTel `recordPluginLifecycle` integration unchanged — covered by existing plugin-manager tests
+- [x] 6.6 Lifecycle dedup tested (BasePlugin re-install after destroy rejected)
+- [x] 6.7 No retroactive ticks
+
+## 7. Archive
+
+- [ ] 7.1 Fold delta into `openspec/specs/game-server/spec.md` (orchestrator task)
+- [ ] 7.2 Archive folder rename (orchestrator task)