feat(runtime): complete the hook, MCP, and memory portability inventories

The new inventories doc maps what's actually Claude-bound. Hooks: only PreCompact and Stop-teardown carry porting decisions, both now decided (prose downgrade, Codex notify or manual). MCP: everything ports mechanically except paging, since signal-mcp exists only claude.ai-side, so the Signal-pager task gains runtime portability as a second motivation. Memory: the KB is already the cross-agent store, and knowledge-base.md now tells agents without harness memory to capture into the session log. Three inventory child tasks closed as dated entries under the generic-agent-runtime parent.

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+#+TITLE: Runtime Portability — Hook, MCP, and Memory Inventories
+#+AUTHOR: Craig Jennings
+#+DATE: 2026-07-13
+
+Decision-prep for the generic-agent-runtime arc (spec: [[file:2026-05-28-generic-agent-runtime-spec.org]]). Three of the eight gap child tasks are inventories; this doc is their deliverable. Each section ends with a verdict and any decision left for Craig.
+
+* Hook parity inventory
+
+What's wired today (global =.claude/settings.json=, symlinked to =~/.claude/settings.json=):
+
+- PreToolUse AskUserQuestion hard-deny — blocks the popup-choice tool, forcing inline numbered options per =interaction.md=. Exists because prose alone failed.
+- PreCompact =precompact-priorities.sh= — saves priorities before context compaction.
+- SessionStart =session-title.sh= (cosmetic title) and =session-clear-resume.sh= (resume-after-/clear plumbing).
+- Stop =ai-wrap-teardown.sh= — sentinel-gated session teardown.
+
+Shipped but unwired (reference copies in =hooks/= + =settings-snippet.json=): =git-commit-confirm.py=, =gh-pr-create-confirm.py=, =destructive-bash-confirm.py=. Not active under Claude either, so they impose no parity requirement today.
+
+Language bundles wire PostToolUse validators per edit (=validate-bash.sh=, =validate-el.sh=, =validate-go.sh=, plus python/typescript equivalents) — and every bundle also ships the same validation as a =githooks/pre-commit=.
+
+Per-hook portability verdicts:
+
+- AskUserQuestion deny: moot off Claude. The popup tool is Claude Code's; Codex-style and local harnesses have no equivalent tool to deny. No port needed.
+- PostToolUse validators: covered off Claude. The bundles' git pre-commit hooks run the same validators, so enforcement survives at commit time instead of edit time. Acceptable downgrade, no work needed.
+- SessionStart clear-resume: not portable as-is; /clear semantics are Claude's. This is the same surface as the "session plumbing per runtime" child task — resolve it there, not as a hook port.
+- session-title: cosmetic, skip on other runtimes.
+- PreCompact priority-save: genuine gap. Codex-style harnesses compact without a hook point. Downgrade is prose (the session-context write triggers in protocols.org already say "save before compaction"), which is weaker but is also the pre-2026 Claude behavior. Accept prose, or shorten sessions on those runtimes.
+- Stop wrap-teardown: partial gap. Codex has a turn-completion notify command that could run the same sentinel-gated script; local harnesses vary. Port the script trigger where a hook point exists; where none does, teardown becomes a manual step in the wrap phrase.
+
+Verdict: only PreCompact and Stop carry real porting work, and both have acceptable degraded modes. Nothing here blocks a pilot.
+
+* MCP portability check
+
+Locally-configured servers (user scope, =~/.claude.json=): linear, notion, figma, slack-deepsat, google-calendar, google-docs-personal, google-docs-work, drawio, google-keep. No project-scope servers anywhere. All are ordinary MCP server definitions, portable to any MCP-speaking harness (Codex CLI reads them from its config; most local harnesses that matter speak MCP now). Port = translate the server blocks + carry the auth material. Mechanical.
+
+claude.ai-managed connectors (session-injected, not in local config): Gmail, and the claude.ai variants of Calendar/Drive. These do not travel. Overlap analysis: calendar and docs are already covered by the locally-configured servers; Gmail's workflow-preferred path is already =cmail-action= (local CLI), so the managed Gmail connector is convenience, not dependency.
+
+Named gap: signal-mcp. protocols.org "Paging Craig" names it as the only supported away-from-desk page path, and it is not in any local config — it lives claude.ai-side. Off Claude there is currently no page channel at all. This lands squarely on the open Signal-pager task ([#C], todo.org): the signal-cli runbook that task produces would be the runtime-neutral paging path. Recommend noting runtime-portability as an added motivation on that task.
+
+Verdict: portable except paging; paging's fix is already a filed task.
+
+* Memory story for non-Claude agents
+
+Claude auto-memory (=~/.claude/projects/<enc>/memory/=, MEMORY.md index) is harness-owned: written by Claude's memory tooling, loaded by its session start. A non-Claude agent should neither read nor write it.
+
+The designed cross-agent store already exists: the org-roam KB (=knowledge-base.md= — reading is plain rg over files, writing is one node per fact, both runtime-neutral). Project state lives in file artifacts every agent reads anyway: todo.org, notes.org, session anchors, docs/.
+
+One wording gap: knowledge-base.md's "Capture, then promote" section names harness memory as the capture layer. For a non-Claude agent the capture layer is the session log itself. Recommended one-sentence addition there: an agent without harness memory captures into its session log and promotes from it at wrap-up. Shared-asset edit, needs approval.
+
+Verdict: no build. One approved sentence in knowledge-base.md closes it.
+
+* Decisions for Craig
+
+All four approved by Craig, 2026-07-13:
+
+1. PreCompact downgrade off Claude: prose-only "save before compaction" accepted.
+2. Stop-teardown off Claude: port via Codex notify where available, manual teardown elsewhere.
+3. Runtime-portability motivation note added to the Signal-pager task.
+4. knowledge-base.md capture-layer sentence added (non-Claude runtimes capture into the session log and promote from there).