docs: codify mvp readiness split

[terisuke]

Summary

• add an MVP readiness register that separates now-required work from later maturity work
• fill the missing local issue briefs so the repo issue pack matches the open GitHub workstreams
• create and align the GitHub MVP readiness epic and sub-issues with the same split

Verification

• docs and issue-structure only
• git diff --check

Closes #15

[Copilot]

Pull request overview

Codifies a “now required vs later” MVP readiness split for the guardrails workstream, and aligns the repo’s local issue-pack documentation with the current GitHub epic/issue structure.

Changes:

• Adds an MVP readiness register documenting what blocks an MVP claim vs what is post-MVP maturity work.
• Updates guardrails planning/tracking docs to reference the new MVP readiness epic and current issue.
• Adds missing local issue briefs (004–009) and updates the migration inventory + issue pack index to match.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/guardrails/README.md	Updates “planned next slices” links to include the MVP readiness epic and post-MVP issues.
docs/ai-guardrails/README.md	Introduces the MVP readiness split section and updates tracking/current-issue references.
docs/ai-guardrails/mvp-readiness.md	New: MVP readiness register defining “now required” vs “later” scope with rationale.
docs/ai-guardrails/migration/claude-code-skills-inventory.md	Updates “Immediate Implications” mapping to the local issue-brief slugs and the now/later split.
docs/ai-guardrails/issues/README.md	Extends the issue-pack index through 009 and documents the MVP split boundary.
docs/ai-guardrails/issues/004-safe-agents-and-commands.md	New: brief for safe agents + workflow commands as MVP-floor work.
docs/ai-guardrails/issues/005-provider-admission-policy.md	New: brief for provider admission policy as MVP-floor work.
docs/ai-guardrails/issues/006-scenario-and-replay-harness.md	New: brief for scenario/replay harness as MVP-floor work.
docs/ai-guardrails/issues/007-plugin-hardening-wave-2.md	New: brief for MVP-floor plugin hardening wave 2.
docs/ai-guardrails/issues/008-authoritative-ci-and-release-gates.md	New: brief for post-MVP authoritative CI/release gates.
docs/ai-guardrails/issues/009-broader-claude-asset-migration.md	New: brief for post-MVP broader asset migration.

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[Copilot]

docs/ai-guardrails/adr/002-provider-admission-lanes.md is listed as a dependency, but there is no 002-* ADR in docs/ai-guardrails/adr/ (only 001, 003, 004). This makes the issue brief’s dependency list non-actionable. Either add the missing ADR 002 (recommended if lanes are a key architectural decision) or update this dependency to point at the correct existing ADR(s).

Suggested change

	- `docs/ai-guardrails/adr/002-provider-admission-lanes.md`
	- relevant existing ADRs in `docs/ai-guardrails/adr/`