fix(media): bound local pilot memory

[jerome-queck]

Summary

• Persist resolved recording and speech durations through media outcomes, metadata, status Markdown, durable state, and queue updates.
• Preserve duration when resuming from retained media so coverage validation does not regress.
• Add queue-schema tests for numeric duration evidence.
• Record the completed direct video/audio rehearsals and the unsupported-shape follow-up.

Closes #107

Live and staged evidence

• CC0015: 76 content-tree appearances — 40 Kaltura, 18 direct, 18 unsupported; 38 Kaltura transcripts complete; 3 direct rehearsals complete (2 video, 1 audio). Two Kaltura appearances remain red after controlled retries.
• PS0002: 133 content-tree appearances — 43 Kaltura and 90 unsupported; all 43 Kaltura transcripts complete.
• MH1101: 7 content-tree plus 27 Media Gallery appearances; all 27 Gallery appearances classified; 26 Kaltura transcripts complete; one non-speech Kaltura appearance remains red after a fresh retry; 7 content-tree appearances remain unsupported.
• Unsupported shapes are classified in aggregate and tracked in ready-for-agent issue Add adapters for remaining NTULearn external-media shapes #120; no signed URLs, cookies, tokens, or session material were persisted.
• Direct durations: 88.3s, 73.0s, and 609.2s. Largest full-batch RSS: 1,987,461,120 bytes (~1.85 GiB); no 2x capture was enabled.
• Semantic QA passed for 110 complete artifact pairs: all formatting guards and timestamp checks passed; code-switching was preserved; no numeric loss, low-overlap, summary-lead, or added-translation candidate was found.
• Focused provider/fallback, capture-restore, and staged 04:00 checkpoint/resumption tests passed.
• Verification: 339/340 tests pass; the lone failure is the existing environment-sensitive media-setup CLI test because this checkout has the real untracked config/courses.json. Lint, formatting, and diff checks pass.

Acceptance

• Rehearse the Y1S2 and Y2S1 media pilot #107.1 setup/model/temp/artifact RAID0 boundary
• Rehearse the Y1S2 and Y2S1 media pilot #107.2 pilot course configuration
• Rehearse the Y1S2 and Y2S1 media pilot #107.3 authenticated content-tree and Gallery census
• Rehearse the Y1S2 and Y2S1 media pilot #107.4 provider-shape comparison plus adapter-ticket follow-up (Add adapters for remaining NTULearn external-media shapes #120)
• Rehearse the Y1S2 and Y2S1 media pilot #107.5 transcript/acquisition fallback branches, with browser capture not naturally available
• Rehearse the Y1S2 and Y2S1 media pilot #107.6 complete transcript semantic inspection set
• Rehearse the Y1S2 and Y2S1 media pilot #107.7 staged 04:00 checkpoint/resumption
• Rehearse the Y1S2 and Y2S1 media pilot #107.8 1x default and 2x safety gate; no 2x approval without provider proof
• Rehearse the Y1S2 and Y2S1 media pilot #107.9 capture restore tests and unchanged audio inventory; no route change available
• Rehearse the Y1S2 and Y2S1 media pilot #107.10 readable course/per-recording status
• Rehearse the Y1S2 and Y2S1 media pilot #107.11 duration/resource/gap/2x evidence

Drift

#107 — Rehearse the Y1S2 and Y2S1 media pilot: 11 of 11 criteria delivered, plus nothing beyond the brief.

Assisted-by: none