Structure acceptance evidence and retire stale checklist wording

[Ankit6149]

Issue linkage

Part of #340

Outcome

• adds a canonical index for docs/acceptance/;
• separates accepted, active/not-yet-accepted, supporting, historical-progress, and negative-control artifacts;
• aligns the GP1 artifact with completed issue [P0][Golden Path 1] Manual thought → opportunity → authentic LinkedIn/X approval with narrative memory #166;
• makes historical production checkpoints inside the GP2 ledger explicitly non-current;
• marks the old ProjectContext pre-merge test plan and progress record as historical instead of leaving them looking like today's execution checklist;
• preserves all underlying evidence and historical checkpoints.

Scope boundary

Documentation/evidence organization only. No product, runtime, acceptance criteria, or capability implementation changes.

Validation

• Exact artifact scopes were read before classification
• [P0][Golden Path 1] Manual thought → opportunity → authentic LinkedIn/X approval with narrative memory #166 is closed as completed
• GP2 remains explicitly NOT YET ACCEPTED
• Historical evidence is preserved rather than rewritten
• Normal repository CI passes
• Verified: branch record was CANCELED and merged master SHA 9dea106dbc339b35731e3048f4c9c81750244efa produced CANCELED production record dpl_A4aN3gnD4fiefG7gzDwvjhzv7N2J; READY production remained Tighten maintenance structure and deployment hygiene #406.

Remaining work

No new product work is created by this PR. External/admin/evidence-only #340 close conditions remain unchanged.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
signal-flow-studio	Ignored		Oct 5, 2026 5:06pm UTC

[Ankit6149]

Post-merge verification:

• merged SHA: 9dea106dbc339b35731e3048f4c9c81750244efa
• Vercel production-target record: dpl_A4aN3gnD4fiefG7gzDwvjhzv7N2J
• state: CANCELED
• no new READY runtime artifact was created
• current READY production remains Tighten maintenance structure and deployment hygiene #406 at 3855358cf7e284a2999c92c7b2f16f7938e5c21e
• branch hygiene removed docs/acceptance-evidence-index; branch inventory returned to two refs