Merge remote-tracking branch 'origin/master' into codex/project-instruction-files

# Conflicts:
#	AGENTS.md
#	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
#	docs/rfc/implemented/architecture/2026-07-05-reconstructable-requests.md
#	docs/rfc/implemented/feature/2026-06-15-code-mode.md
#	docs/rfc/implemented/feature/2026-06-30-hook-bridges.md
#	docs/rfc/implemented/feature/2026-06-30-interception-seams.md
#	docs/rfc/implemented/feature/2026-07-08-repeat-tool-guard.md
#	docs/rfc/proposed/simplification/2026-07-04-prune-dead-core-spine-surface.md
#	examples/AGENTS.md
#	examples/acp-agent/cordis.yml
#	examples/acp-agent/tests/acp.snapshot.ts
#	examples/echo-agent/cordis.yml
#	examples/sandbox-acp-agent/cordis.yml
#	packages/cordis/tool-cordis/src/api-catalog.ts
#	packages/core/agent-core/README.md
#	packages/core/agent-core/src/index.ts
#	packages/core/agent-loop/README.md
#	packages/core/agent-loop/src/loop.ts
#	packages/core/agent-loop/tests/interception.spec.ts
#	packages/core/agent/src/types.ts
#	packages/core/tools/README.md
#	packages/core/tools/src/code-mode.ts
#	packages/core/tools/src/index.ts
#	packages/fs/fs-local/src/index.ts
#	packages/fs/fs/README.md
#	packages/fs/fs/src/index.ts
#	packages/guard/repeat-tool-guard/README.md
#	packages/guard/repeat-tool-guard/src/index.ts
#	packages/hooks/hooks-claude/src/index.ts
#	packages/hooks/hooks-codex/src/index.ts
#	packages/ui/acp-agent/src/index.ts

examples/echo-agent/cordis.yml

@@ -1,9 +1,5 @@
-# The echo-agent plugin tree: the stdio chat app with its LLM backend swapped to
-# the local `mock-echo` mock and the local `echo` tool added. The clean
-# demonstration of "swap the backend, keep the app" — every service the agent
-# needs lives in @deepseek-ai/dsh-stdio-agent (which bundles @deepseek-ai/dsh-
-# agent-core); this leaf only picks the backends, `hmr`, and the app config.
-#
+# Stdio agent with the network-free `mock-echo` adapter and example-local `echo`
+# tool. The app bundle supplies the spine; this leaf selects backends, HMR, and app config.
 # No API key: the `mock-echo` adapter never touches the network.
 
 # Hot-module reload for the dev/demo loop (a leaf entry, not baked into
@@ -13,8 +9,7 @@
   config:
     root: ['.']
 
-# The mock model (registers the `mock-echo` adapter) and the demo `echo` tool —
-# example-local teaching plugins, resolved relative to THIS file's directory.
+# Example-local model and tool plugins resolve relative to this file.
 - id: mock-llm
   name: './src/mock-llm.ts'
 
@@ -34,8 +29,7 @@
   config:
     cwd: !!js process.cwd()
 
-# The stdio chat app: console logger + the agent-core spine (pre-creating the
-# `main` agent on the mock model) + JSONL persistence + the readline UI.
+# The app pre-creates `main` on the mock model and supplies logging, persistence, and readline UI.
 - id: stdio-agent
   name: '@deepseek-ai/dsh-stdio-agent'
   config: