fix(notifications): main Save keeps webhook edits, glue test, docs and nits (#523 review)

Merge-time fixes for the webhook notification channel (ntfy, Slack, Discord, generic JSON).

Minor 1, App Settings Save silently dropped webhook edits: the modal's main Save now
persists the webhook group beside the settings PUT, the same way it already saves the
model config (saveModelConfigFromSettings), but only when the group differs from what
loadWebhook() put on screen (_webhookPending), so an untouched group never re-PUTs. A
refusal (bad URL, enabled with no URL) shows a warning toast, keeps the modal open and
scrolls to the group with the pasted URL still in the box, instead of a success toast.
Send test now saves pending edits first, so it never tests the old URL while the box
shows a new one. The row says so in one line.

Minor 2, no test for the server.ts glue: new test/webhook-push-glue.test.ts drives the
private sendPushNotifications on a real (never started) WebServer with an EMPTY push
store and webhook.json in the instance data dir, delivering through the real
egress-guarded fetch to a local receiver: a permission prompt arrives with the
host-prefixed ntfy Title and body while Web Push is never called, an immediate repeat is
deduped, "response complete" is skipped under scope attention and sent under all, and a
disabled config or a non-push event sends nothing. Verified it fails when the webhook
call is moved below the "no subscriptions" return.

Minor 3, docs: webhook.json added to CLAUDE.md State Files; a Webhooks section in
docs/wiki/Notifications-And-Approvals.md (setup, what is sent, the secret URL, public
ntfy topics, local targets allowed, dedupe, instance-wide reach in multi-user mode) plus
a table row, and a line in Settings-Reference; new section 10c in
docs/security-architecture.md for the second outbound channel through the web-tab
egress guard.

Nits:
- Orphaned JSDoc: the webhook schema moved below the push schemas, so
  PushSubscribeSchema has its comment back.
- Duplicated enums: WebhookUpdateSchema uses z.enum(WEBHOOK_KINDS/WEBHOOK_SCOPES), so
  the schema cannot accept a kind the store would coerce away.
- describeError classifies egress refusals with isEgressBlockedError (the
  CODEMAN_EGRESS_BLOCKED code anywhere in the cause chain) instead of a message regex;
  tests pin a deep cause chain and that matching words alone are not a refusal.
- Markup: the URL input uses set-input, the whitespace-only line is gone, and the switch
  row hints to pick a long random topic on public ntfy.sh.
- Remove a saved URL: a "Remove URL" button (shown only while a URL is saved, with a
  confirm) sends { url: "", enabled: false }.
- Types placement: WEBHOOK_KINDS/SCOPES and WebhookKind/Scope/Urgency/Config/Result/Status
  moved to src/types/push.ts (the IO-side WebhookMessage/Request/Fetch stay in the module).

Browser test extended: main Save persists a pending edit, a refused URL keeps the modal
open with the URL, Send test saves a newly pasted URL first, Remove URL clears it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -431,7 +431,7 @@ One module per domain in `src/web/routes/` (plus a barrel; `ls src/web/routes/`
 
 ## State Files
 
-All in `~/.codeman/`: `state.json` (sessions, settings, respawn, orchestrator, cron jobs/runs, owner tab layouts), `mux-sessions.json` (tmux recovery), `settings.json` (user prefs), `push-keys.json` + `push-subscriptions.json`, `session-lifecycle.jsonl` (audit log), `update-status.json` (self-updater progress, polled across the service restart), `docker-env-applied.json` (Compose deployment only: sha256 of the Dockerfile + compose file the running container was built from, written by `Start-Codeman.sh`, read by the self-updater's environment gate), `docker-build-source.json` (Compose deployment only: the checkout's HEAD commit and `package-lock.json` hash the `codeman-node-modules`/`codeman-dist` volumes currently reflect, written by both `Start-Codeman.sh` and a successful in-place self-update, compared to detect and refresh a volume left stale by an externally-triggered rebuild), `linked-cases.json`, `webviews.json` (saved web-tab dashboard URLs), `remote-hosts.json` + `remote-cases.json`, `docker-hosts.json` + `docker-cases.json` + `docker-exports/`, `subagent-window-states.json` + `subagent-parents.json` (subagent window layout, GET/PUT `/api/subagent-window-states`/`-parents`), `hook-secret` (per-instance), `users.json` (multi-user, mode 0600) + `admin-audit.jsonl`, `intents.json` (Read My Mind intent profiles, mode 0600), `certs/` (self-signed TLS for `--https`), `.env` (CODEMAN_USERNAME/PASSWORD fallback for the `codeman attach` CLI), `install.log` (installer step output, written by `install.sh`'s `run_step`) and `tailscale-rename` (the node name before `install.sh` renamed it, so uninstall can offer it back; both installer-route only). Transient: `self-update-runner.sh`. Multi-user case spaces live OUTSIDE the data dir at `~/codeman-users/<username>/cases` (shared across instances like `~/codeman-cases`, override `CODEMAN_USER_SPACES_DIR`).
+All in `~/.codeman/`: `state.json` (sessions, settings, respawn, orchestrator, cron jobs/runs, owner tab layouts), `mux-sessions.json` (tmux recovery), `settings.json` (user prefs), `push-keys.json` + `push-subscriptions.json`, `session-lifecycle.jsonl` (audit log), `update-status.json` (self-updater progress, polled across the service restart), `docker-env-applied.json` (Compose deployment only: sha256 of the Dockerfile + compose file the running container was built from, written by `Start-Codeman.sh`, read by the self-updater's environment gate), `docker-build-source.json` (Compose deployment only: the checkout's HEAD commit and `package-lock.json` hash the `codeman-node-modules`/`codeman-dist` volumes currently reflect, written by both `Start-Codeman.sh` and a successful in-place self-update, compared to detect and refresh a volume left stale by an externally-triggered rebuild), `linked-cases.json`, `webviews.json` (saved web-tab dashboard URLs), `remote-hosts.json` + `remote-cases.json`, `docker-hosts.json` + `docker-cases.json` + `docker-exports/`, `subagent-window-states.json` + `subagent-parents.json` (subagent window layout, GET/PUT `/api/subagent-window-states`/`-parents`), `hook-secret` (per-instance), `users.json` (multi-user, mode 0600) + `admin-audit.jsonl`, `intents.json` (Read My Mind intent profiles, mode 0600), `webhook.json` (webhook notifications: enabled/service/scope plus the ntfy/Slack/Discord URL, a bearer secret, so mode 0600, kept out of `settings.json` and never returned by `/api/webhook`, which is admin-only in multi-user mode), `certs/` (self-signed TLS for `--https`), `.env` (CODEMAN_USERNAME/PASSWORD fallback for the `codeman attach` CLI), `install.log` (installer step output, written by `install.sh`'s `run_step`) and `tailscale-rename` (the node name before `install.sh` renamed it, so uninstall can offer it back; both installer-route only). Transient: `self-update-runner.sh`. Multi-user case spaces live OUTSIDE the data dir at `~/codeman-users/<username>/cases` (shared across instances like `~/codeman-cases`, override `CODEMAN_USER_SPACES_DIR`).
 
 **Generated top-level dirs** (all gitignored — don't edit or commit): `dist/` (esbuild output), `out/`, `coverage/`, `test-results/`, `tmp/`, `screenshots-echo-diag/`. The committed gesture bundle (`src/web/public/gesture/gesture-codeman.js`) IS tracked, but its runtime wasm/model assets (`src/web/public/gesture/wasm/`, `*.task`) are fetched and gitignored.