happy paths after the senior-dev wave: telemetry --help exits 0, --help's six groups in the manual, wall tile's first activity line

[AbirAbbas]

A happy-path pass over dev c34a3a76d, after the merge wave that brought in senior-dev (#1488), the teams manager and wall (#1429, #1494, #1514, #1516), the one task page (#1485), the crew (#1436, #1518) and the first-run names (#1519). The real binary was driven in tmux against a real model across 40 documented flows: core chat on both roads, senior-dev, tasks and the worker harness, teams and the manager, and the shell doors and places. These three things did not match the manual:

• codeaf telemetry --help exited 1. The group took --help for a sixth verb, and each verb's own --help printed Go's flag: help requested and exited 1. The manual says --help on any verb exits 0. The verbs now go through the binary's shared help seam. TestAskingForHelpIsNotAFailure covers the group and all five verbs, and a new test proves that off --help changes nothing.
• --help has printed six groups since senior-dev: a coding agent built into codeaf takes a whole task, in the folder itself #1488, but the manual still said five. The page now names all six headings in order and says that a build with no carried program prints five.
• A wall tile's activity line was blank on the first read. An idle conversation's tile drew its spend beside an empty line. The manual promises "when it last moved, like updated 5m ago". The first read now takes the transcript's last write time. TestWallFirstReadShowsConversationFileActivity fails on the old code and passes with the fix.

Everything else in the pass held: first run, a reply, a tool edit, slash commands, the places bar, Home, /new, quit and resume, /rewind and --no-host; senior-dev from the shell, in a plain folder, from the chat, and stopped; /task landing, the task room, a proposal's countdown, /stop, /crew and reopening after a restart; teams, the manager, delegation with Traffic, @ mentions, closing and reopening a team, and a restart; exec --json, the belt's shell hands, connect, update --check, every place on a seeded home, and a fresh first run.

Not in this PR:

• The memory place says memory is off on the default engine road. This predates the wave (it is in v0.4.1), filed as memory place says 'memory is off' on the default engine road while memory is on #1535.
• senior-dev's side-list row and its ended card wording are senior-dev: the side row hides its clock while its page is open, and the manual says what the row and card show #1534.
• The tmux e2e suite's drivers are also a separate PR.

Local gates: make test-quick green; make test-laws green; focused cmd/codeaf, internal/tui3 and internal/manual tests green. make pr-ready hit cmd/codeaf's 15-minute package ceiling while three other test runs loaded the box. The test running at the deadline had been going for 6 seconds, so this was load, not a hang, and CI's touched-packages run is the check.

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