changelog: roll up v0.8.0 (32 entries)

[ZeroPoint95]

Roll the 32 accumulated unreleased entries through #1822 into the v0.8.0 changelog section, retaining their headlines, 153 invalidation statements and explanations. The repository selector chooses a minor bump from v0.7.1 because this release includes added and changed user behavior. The refreshed section includes the complete-provider-catalog repair from #1822. All earlier changelog content is preserved; no product code or limits change in this roll-up.

Validation: exact rendering/consumption parity and independent review passed; make pr-ready against dev a6d33d7, make build, and fresh release/changelog tooling suites passed. The complete release-note section fits the tooling's body limit. The actual-number internal entry for #1821 remains in the unreleased folder and describes the refreshed 32-entry scope.

Acceptance retains its recorded scope: ordinary happy paths, real-profile preservation, hosted 16/16 with all three task outcomes, and targeted repairs have accumulated proof. Original #1777 memory/watch and #1790 real updater continuity receipts are retained. Representative built-in ai& connection, all 13 catalog models, and exact reply passed on the reviewed #1822 head; its merged tree matches that head exactly. Automatic title completion remains unverified after incidental headless shutdown cancellation. Historical review coverage remains partial; the completed current-merge V4.1 experiment failed truthfully with non-postable failure records. Zero timed-out reviewers is not a release gate. Maintainer approval was given to defer the intermediate progress wording defect where failed dimensions say “nothing found”; the concrete follow-up remains tracked separately.

Ready for maintainer review and merge after final-head required checks. Staging remains a separate step requiring Full check on the exact merged roll-up SHA and a matching published staging release. Main/stable/production are outside scope.