Live v2: root manifest, mount-ack protocol, AST scaffolder, mechanical accept

A ground-up hardening of live mode, driven by a production session in a
nested-app monorepo that hit six distinct failure classes. Full design
rationale in docs/LIVE-REWRITE-PLAN.md; every Codex-reported failure now
has a mechanical fix and a regression test.

Roots: live/roots.mjs resolves appRoot/repoRoot/contextRoot once at boot
(keyed on dev-server configs, not monorepo brand markers), persists a
manifest, and every live CLI re-anchors onto it at startup, so a helper
run from the wrong directory can no longer fork session state. Context
files are discovered upward to the git root.

Render truth: variant_mounted / variant_mount_failed events give the
journal per-variant mount state; failures reach the agent's poll queue,
raise a persistent error card with Retry (no more localStorage wipe), and
an attach probe names root/dev-server mismatches explicitly. The browser
rehydrates from the server when localStorage is gone.

Svelte: the scaffolder now parses with the app's own svelte 5 compiler.
Control flow survives (an each collection crosses the contract as one
structured prop), keyed each blocks hydrate synthetic keys, and anything
a detached preview cannot support falls back to source-preview instead of
shipping a wrong scaffold. Preview modules live in per-publish revision
directories, defeating stale transform caches.

Accept: CSS is reconciled, not appended. Matching selectors are replaced,
params bake from params.json kinds, the compiler's unused-selector pass
prunes superseded rules (pre-existing dead rules protected), a selector-
loss postcondition refuses any write that would drop hand-written rules,
and live-complete refuses to finish while live plumbing remains in source.

Also: framework registry (live/frameworks/) with a crash-safe injection
journal, session-store snapshot caching with read-only reads, protocol
enum consolidation, steer Send button, honest DESIGN-panel empty states.

Testing: new unit suites (roots, AST scaffolder, accept CSS, accept
pipeline, framework conformance); e2e now fails on preview-tree 404s,
proves computed-style mount for every variant, drives the Tune panel
through baked params, and injects failures (broken mounts, republish,
storage loss). New runtime fixtures: monorepo-nested-vite (repo root !=
app root) and vite8-sveltekit-stateful (each blocks + state). Nightly
full-matrix cron. An independent adversarial review pass preceded this
commit; its blocker and major findings are fixed and regression-tested.

This work was produced with AI assistance (Claude Code).

Co-Authored-By: Claude Code <noreply@anthropic.com>

scripts/test-suites.mjs

@@ -124,6 +124,7 @@ export const SUITES = {
         runner: 'node',
         files: [
           'tests/live-accept.test.mjs',
+          'tests/live-accept-css.test.mjs',
           'tests/live-accept-scrub.test.mjs',
           'tests/live-browser-dom.test.mjs',
           'tests/live-browser-script-parts.test.mjs',
@@ -140,6 +141,7 @@ export const SUITES = {
           'tests/live-e2e-steer-agent.test.mjs',
           'tests/live-e2e/agent-insert.test.mjs',
           'tests/live-event-validation.test.mjs',
+          'tests/live-frameworks.test.mjs',
           'tests/live-generation-preflight.test.mjs',
           'tests/live-inject.test.mjs',
           'tests/live-insert.test.mjs',
@@ -150,10 +152,13 @@ export const SUITES = {
           'tests/live-poll-stream.test.mjs',
           'tests/live-recovery-commands.test.mjs',
           'tests/live-reference.test.mjs',
+          'tests/live-roots.test.mjs',
           'tests/live-server.test.mjs',
           'tests/live-session-store.test.mjs',
           'tests/live-source-lock.test.mjs',
           'tests/live-source-search.test.mjs',
+          'tests/live-svelte-ast.test.mjs',
+          'tests/live-svelte-component-accept.test.mjs',
           'tests/live-tanstack-adapter.test.mjs',
           'tests/live-target-context.test.mjs',
           'tests/live-wrap.test.mjs',
@@ -171,7 +176,8 @@ export const SUITES = {
       /^skill\/scripts\/(detect-csp|live-inject|live-wrap)\.mjs$/,
       /^skill\/scripts\/lib\/is-generated\.mjs$/,
       /^skill\/scripts\/lib\/template-extensions\.mjs$/,
-      /^skill\/scripts\/live\/(source-search|sveltekit-adapter)\.mjs$/,
+      /^skill\/scripts\/live\/(source-search|sveltekit-adapter|tanstack-adapter)\.mjs$/,
+      /^skill\/scripts\/live\/frameworks\//,
     ],
     commands: [
       {