v2.0.0: rename /tdd to /implement, simplify Phase 6, deprecate side r…

[one-kash]

…epos

Breaking changes:

• /tdd renamed to /implement; skill dir skills/tdd -> skills/implement; speckit ID speckit.dev-workflow.implement (alias speckit.implement)
• Tracker filename: impl-tracker-.json (was tdd-tracker-*.json)
• Phase 6 parallel reviewer is /code-review (read-only) instead of /simplify (which writes); review pair is now both read-only
• This repo is the only distribution channel; ai-agent-spec-skill and ai-agent-tdd-skill are deprecated; sync.sh + sync-skills.yml removed

Process simplification:

• Drop tracker resume field; pattern hints/pitfalls move to optional notes. Required fields (name, files_*, tdd, acceptance_criteria) already carry resume context
• Merge Standards into review-impl Criterion 4 (Code Quality + Architectural Gaps) and Blindspots into Criterion 6 (Robustness + Blindspots); drop the inline self-check that duplicated 6/8 criteria
• Prune 5 duplicate Lessons Learned (constructor cascading, TDD-fix- code, extract-UI-logic, dead-code-same-chunk, review-plan-before- coding) — each duplicated content from earlier phases. 19 -> 14
• Phase 2.5 verdict block trimmed; tracker plan_review field carries the gate forward across session resets

Added:

• UI state-holder vs rendering-only distinction in test-strategy table with detection signals (mutableStateOf, useState, LaunchedEffect, etc.)
• Both reviewers verify the "Pure UI — no test" exemption isn't misapplied to chunks that introduce hoisted state or branching effects
• Small-feature shortcut keeps both review gates (only chunking and Plan Mode collapse for 1-chunk features)