Cut the agentic guidance layer to a mission charter

[lunelson]

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Project	Deployment	Actions	Updated (UTC)
hash	Ready	Preview	Aug 28, 2026 12:47pm
petrinaut	Ready	Preview	Aug 28, 2026 12:47pm
petrinaut-docs	Ready	Preview	Aug 28, 2026 12:47pm

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[lunelson]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Keep upcoming-mission drafts at conversational fidelity. #9405
• FE-1524: Prove idempotent capture sweep on the live Flue chat path #9384
• Replace the elicitation path with a plain Petrinaut-to-Flue chat. #9382
• Cut the agentic guidance layer to a mission charter #9381 👈 (View in Graphite)
• FE-1507: Move the repertoire into core behind a guarded prompts subpath #9349 : 1 other dependent PR (#9355 )
• FE-1431: Build the plugin authoring surface (cycle two) #9348
• FE-1505: Time each interviewer turn by purpose #9347
• FE-1506: Show captures and completion while a panel elicitation runs #9346
• FE-1504: Run the process-model elicitor from the Petrinaut panel on one owned document #9345
• FE-1431: Build the plugin authoring surface #9337
• FE-1406: Audit the harness-teaching lineage and propose the fixed-key plugin contract (ADR-0007) #9327
• FE-1497: Build the controller read path and the SDCPN plugin package #9325
• FE-1404: Run condition 3 as the walking skeleton #9322
• FE-1403: Assemble and test the CPS interview guidance #9321
• FE-1402: Define and rehearse the elicitation completion contract #9320
• FE-1407: Catalogue elicitor failures that published measures miss #9319
• FE-1480: Project and realize a CPS model as a Petrinaut SDCPN #9313
• FE-1495: Prevent Brunch TypeScript contracts from drifting #9312
• FE-1494: Keep Brunch strategy and control records coherent #9311
• FE-1437: Move brunch-agent into hashintel/hash with its history #9274
• main

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[cursor]

PR Summary

Low Risk
Documentation and agent-guidance only; no runtime, auth, or data-path changes. CI could fail if tests still require deleted docs/INDEX.md—not shown updated in this diff.

Overview
Replaces Brunch’s agentic steering / arc-close / wayfinding layer with a mission-first charter: AGENTS.md now centers three laws, a six-field mission contract in MISSION.md, and explicit rules that specs, ADRs, and evidence are reference—not obligations.

Adds MISSION.md (Mission 1: prove Petrinaut ↔ plain Flue chat end-to-end before harness semantics) and docs/adr/README.md framing ADRs as historical hypotheses.

Removes or retires the old control surface: docs/INDEX.md, docs/control/SPEC-LEDGER.md, arc-close skills, and agent protocols for steering, legibility, documentation topology, partition worktrees, triage labels, and arc-close. Trims CONTEXT.md (drops strategic-control and demo-specific glossary) and rewrites surviving git-workflow, issue-tracker, and issue-writing docs around one issue / one branch / one PR with the branch mission as authority.

Updates apps/brunch-agent/AGENTS.md and the context README.md to point agents at MISSION.md and mission-scoped composition instead of mandatory ADR/spec reads.

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