fix(models): publish Astra through compatible model feeds

[rynfar]

GPT-6 Astra is discovered by Codex but appears under Legacy because Pylon's current-model list omits it. The hosted manifest has also been stale since September 2: publication rejects the provider catalog field introduced by the Claude model-catalog integration.

Add Astra to the current-model list, porting upstream #9762 (bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00). Repair publication by using the server's manifest decoder and publishing two files in one commit: the original classification feed for older strict readers, and a complete catalog at model-catalog.json for current servers. Both outputs keep the 32 KiB limit. The workflow prepares the files from the approved revision before checking whether it is still current and accessing the release credential.

Web, desktop, and mobile consume the same server classification, including remote and tunnel connections. This change preserves explicit model selections and the existing default-model preference. Update the publishing runbook and record the targeted adoption without advancing the full upstream review cursor.

Validation: 16 focused manifest/publication and Claude catalog tests pass; server typecheck passes with existing suggestions; targeted lint and formatting pass; actionlint passes. Ran the publication CLI under Node 24.13.1 and compared both generated JSON files with the source. No browser or simulator was used. Publication to the hosted feed happens after merge and still needs its workflow result checked.

Implemented with GPT-6 Astra through the Codex harness.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.6 KiB	13.6 KiB	−13 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	−2 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.5 KiB	−11 B (−0.2%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.5 KiB	56.5 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	8	8	0 (0.0%)	21	✅
Claude	Total thread wire	13.6 KiB	13.6 KiB	+8 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	−5 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.6 KiB	6.6 KiB	+13 B (+0.2%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.3 KiB	57.3 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	8	8	0 (0.0%)	21	✅

Baseline: 2f02e71 · PR result: 1ee780b · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 111.2 KiB
• Claude decoded thread snapshot: 111.9 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.