fix(sessions): stop pinning the w1-myapp placeholder as Claude's /resume title (#457)

* fix(sessions): stop pinning the w1-myapp placeholder as Claude's /resume title

Local claude spawns passed the tab name as `--name`. That flag is not only the
cross-session peer name: it is also the prompt-box label, the `/resume` picker
entry and the terminal title, and a pinned title stops Claude generating its own
(`customTitle ?? aiTitle`). So every conversation of a case was listed in
`/resume` as the same `w1-myapp`, and none of them got a generated title. On one
workspace, 34 of 34 conversations spawned with `--name` had no ai-title, while
every conversation spawned without it had one.

Only a name the user chose is pinned now: `Session.cliPinnedName` is the name
when `nameSource === 'manual'`, carried to the builders as a separate `cliName`
so the tab/mux name is untouched. Placeholder and auto names let Claude title
the conversation again.

A rename in Codeman also reaches `/resume`: the new name is appended to the
conversation's transcript as the `custom-title` row `/rename` writes (never
creating the file, never writing an empty title). For a pane spawned without
`--name` this holds immediately; a pane spawned with one re-appends its own
title each turn, so there the new name holds from the next spawn.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* fix(sessions): skip no-op renames and docker sessions when syncing the /resume title

A same-name PUT (the Session Options field saves on blur and recomposes the
unchanged placeholder) no longer flips nameSource to manual or appends a
custom-title row, and docker sessions skip the host transcript scan since their
transcript lives in the container. The skill pages no longer use a w<N>- name
as the peer-name example, and the changeset notes the re-append caveat.

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

* docs: record that nameSource decides --name and renames reach /resume

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

---------

Co-authored-by: codeman-local <codeman@local>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/agent-control-plan.md

@@ -757,3 +757,13 @@ works, and its replies arrive tagged `from-name="w9-msgtest"` (a derived-name
 worker's replies carry no `from-name`). A quick-start without `sessionName` has an
 empty Codeman name, so the peer name stays derived: agents should name their
 workers. Tests: `test/name-flag-injection.test.ts`.
+
+Later narrowing: `--name` is not only the peer name but also the `/resume` picker
+entry and the terminal title, and a pinned title stops Claude generating its own, so
+pinning the `w1-myapp` placeholder listed every conversation of a case under the same
+name in `/resume`. Only a manual name is pinned now (`Session.cliPinnedName`,
+`nameSource === 'manual'`, carried to the builders as `cliName`); placeholder and auto
+names leave Claude to title the conversation. A rename in Codeman appends a
+`custom-title` row to the conversation's transcript (`claude-session-title.ts`), the
+row `/rename` writes. Tests: `test/claude-resume-title.test.ts`,
+`test/routes/session-name-routes.test.ts`.

docs/architecture-invariants.md

@@ -199,6 +199,8 @@ Further detail (current geometry and colors, superseding the dip numbers above w
 
 **Opt-in, and the listener orders its checks for cost.** The prompt lands in the tab name, `mux-sessions.json`, every `session:updated` broadcast, the TUI, both home screens and `/api/search` (which matches on `sessionName`), while Read My Mind deliberately keeps prompts 0600 and out of search because prompts can carry secrets; so `autoNameSessions` is synced and default OFF, like `agentSkillEnabled`, `approvalsInboxEnabled` and `readMyMindEnabled`. The listener checks `nameSource` and derives the title BEFORE reading `settings.json`, so an already-named session costs nothing per prompt.
 
+**`nameSource` also decides what claude is told to call the conversation.** `--name` is the prompt-box label, the `/resume` picker entry and the terminal title at once, and a pinned title stops Claude generating its own, so only a `manual` name is passed (`Session.cliPinnedName`); pinning the `w1-myapp` placeholder gave every conversation of a case the same `/resume` entry. A rename through `PUT /api/sessions/:id/name` is carried into `/resume` by appending the `custom-title` row `/rename` writes (`claude-session-title.ts`), for local transcripts only: a remote pane's lives on the remote host and a docker pane's inside the container. The route returns early on an unchanged name, because the Session Options field saves on blur and recomposes the same placeholder, which would otherwise flip it to `manual` and re-pin it.
+
 Further detail: the `<prefix>: <title>` form (`w3-myapp: fix the login redirect`) is the one `parseSessionPrefix()` (app.js, #232) already renders as the title alone with the prefix in the tooltip, and that `_nextCaseSessionStartNumber()` still counts. The `name` setter is reached via `PUT /api/sessions/:id/name`. The listener lives in `session-listener-wiring.ts`. Tests: `test/session-auto-name.test.ts`, `test/session-listener-wiring.test.ts`, `test/routes/session-name-routes.test.ts`.
 
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