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Michał Pierzchała 1a76344685 docs: restructure AGENTS.md and CONTEXT.md for progressive disclosure (#1402)
* docs: restructure AGENTS.md and CONTEXT.md for progressive disclosure

Apply the Claude 5 context-engineering guidance to the repo's agent docs:
keep the always-loaded file to gotchas and invariants, and move situational
guidance one hop away behind a routing table.

AGENTS.md 315 -> 229 lines. Cut generic agent-behavior boilerplate, three-way
duplication (Common Mistakes restated Hard Rules; Finding Source Owners
restated the registry section), and facts visible from the repo itself.
Kept verbatim: the expensive-lessons principles, enforcement gates, Hard
Rules, and environment traps.

Split out docs/agents/{cli-flags,pull-requests,device-verification}.md and
folded the Testing Matrix into docs/agents/testing.md, reframed around
pnpm check:affected so the prose stops duplicating the selector.

CONTEXT.md keeps all 50 terms, now grouped under a section index so a task
loads one section instead of the whole glossary.

* fix(check-affected): move the selector-owning sentinel to the Testing Matrix

The Testing Matrix moved from AGENTS.md to docs/agents/testing.md, but the
affected-check selector still treated only AGENTS.md as selector-owning. A
later matrix edit would have been classified as inert docs and skipped the
fail-open, so the selector could keep deriving gates from a spec that had
changed underneath it.

Move the sentinel with the prose, as a named SELECTOR_OWNING_DOCS set so the
next move is one line, and fix the two in-code comments plus the testing.md
paragraph that still pointed at the AGENTS.md matrix.

* docs: restore two rules dropped by the AGENTS.md split

Review caught two repo-specific rules that did not survive the move. Both are
prose without any backticked identifier, so the identifier-diff used to verify
the split could not see them.

- "Test through public interfaces; do not add unrelated production exports
  solely to enable tests" returns next to the behavioral-tests rule in
  docs/agents/testing.md, with the reason it exists.
- The guidance-ownership rule (decide whether new guidance/schema/metadata
  belongs to the command surface, CLI grammar, CLI help, MCP projection, or
  daemon runtime) returns to the always-loaded Docs & skills section, since it
  governs all command-surface work and not just the flag case.

Also point the ADR routing row at docs/adr/README.md, which is already the
"read when you touch…" index, rather than at the bare directory.
2026-07-25 12:13:09 +02:00
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