feat(projections): add decision-impact guidance hook

[szmyty]

Summary

• add one canonical, draft decision-impact AGENTS.md module that pins the proposed Hygiene ADR policy 1.0.0 and Repository Intelligence 1.0.0-alpha.1 at immutable revision 5e0602265b6ac5e5165b89f418e55a3fd12f8a64
• define the mandatory create/update/supersede/reference/ADR not required checkpoint, ambiguity behavior, representative consequential/routine examples, and stable roadmap/ADR reference conventions
• inject or refresh the managed block exactly once across GitHub, Claude Code, OpenCode, and Zencoder projections, with source/module provenance and malformed-duplicate rejection
• generate a repository-root AGENTS.md integration fixture, bump the additive projection interface to 1.1.0, and document consumer-owned reconciliation boundaries
• add AET-Q07 to the roadmap, connect issue Add a decision-impact and ADR hook to canonical AGENTS guidance #49, update Aether's own Copilot instructions, and regenerate the checked-in GitHub projections

Decision impact

Classification: reference. Aether ADR-001 and ADR-002 already establish canonical-source/generated-output separation and Aether's distribution ownership, so this additive minor projection change does not introduce a new artifact lifecycle or ownership boundary. The module references egohygiene/hygiene#ADR-002 and egohygiene/hygiene#ADR-005 without claiming either proposed upstream contract is accepted.

Automated agents remain unable to mark ADRs accepted.

Validation

• python3 -m unittest tests.test_provider_projections — 14 tests passed
• fresh ./aether distribution build plus --check — all 40 projection outputs current
• ./aether validate --format "text" — completed
• catalog generation, schema validation, and provenance validation — passed
• deterministic evaluations — passed
• full ./aether test — 99 of 100 tests passed locally; the remaining consumer-installation E2E could not start because this workspace has no gh executable. Its failure occurs during tool-version discovery before exercising repository code.

Closes #49

Roadmap-Step: AET-Q07
ADR-Ref: ADR-001
ADR-Ref: ADR-002
ADR-Ref: egohygiene/hygiene#ADR-002
ADR-Ref: egohygiene/hygiene#ADR-005

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