Short project addresses: follow-ups from the reviews of #183

[trakhimenok]

Open minors from the three reviews of #183 (last: #183 (comment)). Before the demo is switched on (gate D-ON), close at least: the matrix-parameter question reaching analytics before the router strips it (drop ;msg=/;q= in the inline script), and the named-ref default-branch lookup not raced against the probe timer. The rest are listed in the review comments on #183 (round 1 minors 4, 5, 7, 8, 9, 10, 12; round 3 minors 2-3). The demo flag is not consulted by the page choice yet; G-A4b/G-A5 own that.

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[trakhimenok]

From the review of #186 (#186 (comment)): strip a pasted #msg= through Angular so the router's URL agrees (and add the Sentry breadcrumb scrubber in G-A4b); save the old-chat reload key under the start-chat path; fix the vacuous replaceUrl unit test at datatug-app-routes.spec.ts:273.

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[trakhimenok]

From the review of #187 (#187 (comment)): tighten the address regression guard (per-occurrence exceptions, more patterns), record the hand-off parsers and the start-chat builder as explicit exceptions, fix stale comments in main.ts/agent-base-url.spec.ts, encode or document unsupported agent project ids, update the stale demo-link fake in demo-holding-page.component.spec.ts.

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