Merge remote-tracking branch 'origin/master' into worktree/provider-routed-llm-adapters

# Conflicts:
#	docs/config-catalog.md
#	docs/cordis-catalog/events.md
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/core.md
#	docs/event-producer-consumer.md
#	docs/persistence-catalog.md
#	examples/acp-agent/tests/snapshots/advanced-toolchain/session.1.jsonl
#	examples/acp-agent/tests/snapshots/advanced-toolchain/session.2.jsonl
#	examples/acp-agent/tests/snapshots/advanced-toolchain/session.jsonl
#	examples/acp-agent/tests/snapshots/both-mode-turn/session.jsonl
#	examples/acp-agent/tests/snapshots/hook-cc-pretool-ask/session.jsonl
#	examples/acp-agent/tests/snapshots/skill-load/session.jsonl
#	examples/acp-agent/tests/snapshots/text-turn/session.jsonl
#	examples/sandbox-acp-agent/cordis.yml
#	examples/sandbox-acp-agent/tests/snapshots/escalation-approved/session.jsonl
#	examples/sandbox-acp-agent/tests/snapshots/escalation-rejected/session.jsonl
#	examples/sandbox-acp-agent/tests/snapshots/mode-switching/session.jsonl
#	packages/compact/compact-basic/README.md
#	packages/compact/compact-basic/src/index.ts
#	packages/compact/compact-basic/tests/compact-basic.spec.ts
#	packages/core/agent-loop/README.md
#	packages/core/agent-loop/src/loop.ts
#	packages/core/agent-loop/tests/properties.spec.ts
#	packages/core/session/README.md
#	packages/core/session/src/types.ts
#	packages/core/session/tests/derived-cache.spec.ts
#	packages/llm/llm-deepseek/src/index.ts
#	packages/llm/llm-pi-ai/README.md
#	packages/llm/llm-pi-ai/src/adapter.ts
#	packages/llm/llm-pi-ai/src/convert.ts
#	packages/llm/llm-pi-ai/tests/adapter.spec.ts
#	packages/llm/llm/README.md
#	packages/llm/llm/src/call-config.ts
#	packages/llm/llm/src/index.ts
#	packages/ui/acp-agent/src/index.ts
#	packages/ui/acp/tests/harness.ts
#	packages/ui/jsonrpc/README.md
#	packages/ui/jsonrpc/src/server.ts
#	packages/ui/stdio-agent/README.md
#	packages/ui/stdio-agent/src/index.ts
#	python/sdk/README.i18n.yaml

packages/core/session/tests/derived-cache.spec.ts

@@ -1,10 +1,7 @@
 /**
- * Derived-message cache tests: the session projects each surface node exactly
- * once (O(new nodes) per call), rebuilds on a surface rewrite (replace /
- * invalidate — the replaceGeneration signal), returns a fresh array snapshot
- * per call over shared frozen messages, and stays deep-equal to a from-scratch
- * replay derivation at every step — the incremental==scratch property the
- * reconstructability RFC's invariant enforces in dev at request time.
+ * Derived-message cache contract against a scratch oracle: project new nodes
+ * once, rebuild on surface generation changes, return fresh arrays over shared
+ * frozen messages, and remain value-equal to replay at every step.
  */
 
 import { describe, expect, it } from 'vitest'
@@ -28,7 +25,6 @@ describe('derived-message cache', () => {
     userText(session, 'two')
     session.append('assistant/message', { provenance: { provider: 'mock', model: 'mock' }, turn: 1, step: 1, content: [{ type: 'text', text: 'reply' }] }, { surfaceOp: 'append' })
     expect(session.deriveMessages()).toEqual(scratch(session))
-    // An empty-content assistant/message (usage host) projects to nothing.
     session.append('assistant/message', { provenance: { provider: 'mock', model: 'mock' }, turn: 1, step: 2, content: [], usage: { inputTokens: 1, outputTokens: 0 } }, { surfaceOp: 'append' })
     expect(session.deriveMessages()).toEqual(scratch(session))
   })
@@ -48,7 +44,6 @@ describe('derived-message cache', () => {
 
     expect(session.deriveMessages()).toHaveLength(1)
     expect(session.deriveMessages()).toEqual(scratch(session))
-    // The array a caller took before the replace is untouched.
     expect(beforeReplace).toHaveLength(2)
   })
 
@@ -61,7 +56,7 @@ describe('derived-message cache', () => {
     const second = session.deriveMessages()
     expect(first).toHaveLength(1)
     expect(second).toHaveLength(2)
-    // Shared projection objects: the same frozen message instance, once ever.
+    // Array snapshots share their frozen message projections.
     expect(second[0]).toBe(first[0])
     expect(Object.isFrozen(first[0])).toBe(true)
   })
@@ -74,7 +69,6 @@ describe('derived-message cache', () => {
     session.surface.invalidate()
     const after = session.deriveMessages()
     expect(after).toEqual(before)
-    // A rebuild re-projects: fresh objects, same values.
     expect(after[0]).not.toBe(before[0])
   })
 })
@@ -84,8 +78,7 @@ describe('Session.deriveEventMessage — the per-event projection', () => {
     const session = new Session(SessionId('per-event'))
     session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
     const event = session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, { surfaceOp: 'append' })
-    // The fold path (deriveMessages) and the per-event path share the
-    // projection, so an external reconstructor cannot disagree with the cache.
+    // Full and per-event derivation share one projection.
     expect(session.deriveEventMessage(event)).toEqual(session.deriveMessages().at(-1))
   })