Add immutable Trial lineage and an interactive experiment progression graph

[MrScripty]

Trials previously retained execution material without first-class derivation or comparison ancestry. This adds immutable experiment intent and exact parent/baseline references across Studies, plus a production Pipeline graph linking recipe edits, saved outcomes and existing exact checkpoint comparisons.

Branch from Trial copies its retained recipe snapshot, then uses the normal editor and material capture. Preparation remains inert; explicit finite admission remains with Studies/Runs. Historical Trial bytes and all 101 existing operation contracts stay unchanged. Schema10 is an explicit additive quiesced migration; schema1–9 DDL/hashes and backup/restore are preserved. See docs/contracts/experiment-lineage.md.

Validation:

• 13 real PostgreSQL lineage tests passed, including concurrent identical delivery, audit rollback, lost commit reply, migration/restore, permissions and admitted external overview without capture reads.
• Expanded controller race/reconciliation tests passed independently; all eight existing workspace controller suites and the Chromium recovery gate passed.
• Frozen-source Chromium151 browser gate passed 13 checks with three actual CPU Runs, retained branching into a second Study, zero Run admissions on preparation, unchanged parent material, exact compatible/incompatible checkpoint comparison, correction/new release, reload, access projection, keyboard and measured dark contrast. It captured 25 desktop/mobile screenshots. Browser receipt binds the exact current 15 source hashes; the follow-up commit changes only two handcrafted test composition fixtures.
• Independent review fixed and rechecked actor/session/remount/cohort races and preserves exact admission keys even when a postcommit Run read fails.

All 143 affected local regressions passed. All four workflows passed on final head ee07e415: full lifecycle, captured CPU package/fresh inference, workspace UI, and extension catalog. Independent exact-head review is clear; all 101 pre-existing contracts and schema1–9 definitions remain unchanged. Tiny authored CC0 fixtures qualify the workflow only; no production scientific acceptance or accelerator qualification is claimed.

[coderabbitai]

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