fix(cli-registry): guard workDetect.workingLine like every other config regex

#385 made the composer glyph and the working status line per-CLI registry
data, which is right, but `workingLine` arrived as a config-supplied regex
validated with a bare `new RegExp()`. That skips `compileVersionRegex()`,
the helper the registry uses for exactly this: a `~/.codeman/clis.json`
override can set the field, the compiled pattern is run against every
accumulated PTY chunk and every pane capture, and a nested quantifier there
backtracks on the event loop for the whole server rather than one session.

Route it through the helper in both places, which are not redundant: the
schema refine rejects the entry at LOAD time so a bad pattern never reaches
a session, and `_workingLinePattern()` compiles through the same helper so
the runtime cannot hold a pattern the schema would have refused. The helper
returns null instead of throwing, so the Claude-pattern fallback stops being
a try/catch and becomes structural. Both shipped patterns compile unchanged,
and Claude's is behaviourally identical to CLAUDE_WORKING_LINE_PATTERN.

Also match the Codex footer case-insensitively on the E. It was
characterised against codex-cli 0.152.1, which prints a lowercase `esc`;
a version capitalising it would make the whole fix silently inert, since
the pane would simply never look like it was working.

Docs: CLAUDE.md, architecture-invariants and cli-registry.md all still
stated the Claude-mode-only rule this PR retires, and none of them named
the new capability or the regex guard.

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

src/config/cli-registry/stock.ts

@@ -429,7 +429,7 @@ const CODEX: CliEntry = {
     // `Working (2m 49s • esc to interrupt)` above it while a turn runs. It animates no
     // braille spinner, and it never prints `esc to interrupt` at rest, so that phrase
     // alone separates a running turn from an idle one.
-    workDetect: { promptGlyph: '›', workingLine: 'esc to interrupt' },
+    workDetect: { promptGlyph: '›', workingLine: '[Ee]sc to interrupt' },
     transcript: 'codex-rollout',
     altScreen: 'strip-full',
     echo: { policy: 'predict', anchor: { kind: 'cursor' }, predictProfile: 'codex' },