Retier post-change validation to per-change/per-milestone cadence

CLAUDE.md

@@ -33,6 +33,7 @@ bun run test:backend:coverage # Cargo test + llvm-cov, enforces 100% line covera
 bun run test:all              # Both Vitest and Cargo test
 
 bun run validate-build   # All gates: lint + format + typecheck + build
+bun run validate-build:fast # Per-change tier: lint + format + typecheck + debug backend build (no bundle/sign)
 ```
 
 ## Testing
@@ -41,7 +42,7 @@ Tests use **Vitest** for the frontend (React/TypeScript with React Testing Libra
 
 **100% code coverage is mandatory.** Any new or modified code — frontend or backend — must maintain 100% coverage across lines, functions, branches, and statements. PRs that drop below 100% coverage will not be merged.
 
-**Always run `bun run test:all:coverage` (never the bare `bun run test` / `bun run test:all`).** This single command runs both Vitest with coverage and the cargo llvm-cov gate that CI enforces. If it does not exit cleanly, the task is not done. Functions excluded from coverage with `#[cfg_attr(coverage_nightly, coverage(off))]` must be thin wrappers (Tauri commands, filesystem I/O) whose logic is tested through the functions they delegate to.
+**At milestone/PR time, always run `bun run test:all:coverage` (never the bare `bun run test` / `bun run test:all`).** This single command runs both Vitest with coverage and the cargo llvm-cov gate that CI enforces; see "Post-Change Validation" below for the full per-change vs per-milestone cadence. If it does not exit cleanly, the feature is not done. Functions excluded from coverage with `#[cfg_attr(coverage_nightly, coverage(off))]` must be thin wrappers (Tauri commands, filesystem I/O) whose logic is tested through the functions they delegate to.
 
 ## Since v0.15
 
@@ -166,12 +167,26 @@ Structure:
 
 ## Post-Change Validation
 
-After making any code changes and before ending your response, you must:
+Validation runs on two tiers: fast checks after every code change, full gates once per feature/PR. This is a change in cadence only, not a lowered bar: CI still runs the full gates on every PR, and the 100% coverage requirement at merge time is unchanged.
 
-1. Run `bun run test:all:coverage` — frontend + backend tests must pass AND 100% coverage gate must hold
-2. Run `bun run validate-build` — must complete with **zero warnings and zero errors**
+### Per-change (every edit, fast)
 
-Do not consider the task done if either step produces any warnings or errors. Fix all issues first.
+After each code change and before ending your response, run the checks scoped to what you touched:
+
+- Backend: `cd src-tauri && cargo test --lib <module>::` for the touched module(s), plus `cargo clippy -- -D warnings` and `cargo fmt --check`
+- Frontend: `bunx eslint <touched files>` and `bun run typecheck` (`tsc --noEmit`)
+- Or, as a single convenience command covering lint + format + typecheck + a debug backend build: `bun run validate-build:fast`
+
+Do **not** run `test:all:coverage` or `validate-build` at this tier: no llvm-cov, no release build/bundle/sign. Fix anything this tier surfaces before moving on.
+
+### Per-milestone (once per feature, PR, or session end)
+
+Before declaring a FEATURE or PR done, run the full gates once and fix regressions in one batch:
+
+1. `bun run test:all:coverage`, frontend + backend tests must pass AND the 100% coverage gate must hold
+2. `bun run validate-build`, must complete with **zero warnings and zero errors**
+
+Do not consider the feature done if either step produces any warnings or errors. This full pass is what "done" means; the per-change tier above only stops you from re-paying its cost on every intermediate edit.
 
 ## Superpowers Artifacts
 

package.json

@@ -33,7 +33,8 @@
     "test:backend:coverage": "cd src-tauri && cargo +nightly-2026-03-30 llvm-cov --ignore-filename-regex \"(lib|main)\\.rs\" --fail-under-lines 100",
     "test:all": "vitest run && cd src-tauri && cargo test",
     "test:all:coverage": "vitest run --coverage && cd src-tauri && cargo +nightly-2026-03-30 llvm-cov --ignore-filename-regex \"(lib|main)\\.rs\" --fail-under-lines 100",
-    "validate-build": "bun run lint && bun run format:check && bun run typecheck && bun run build:all"
+    "validate-build": "bun run lint && bun run format:check && bun run typecheck && bun run build:all",
+    "validate-build:fast": "bun run lint && bun run format:check && bun run typecheck && cd src-tauri && cargo build"
   },
   "dependencies": {
     "@fontsource/nunito": "^5.2.7",