fix(tui): truncate fractional mtimes in fresh plugin specifiers - #41891

What

External TUI plugins that use JSX or import solid-js / @opentui/solid fail to load in the compiled opencode2 binary unless a compatible node_modules happens to sit above the plugin file. The cause is one character: freshSpecifier appends raw stat.mtimeMs to the import specifier, and on APFS that value is almost always fractional — plugin.tsx?mtime=1786494961337.0317. The extra dot in the query makes Bun's compiled binaries skip runtime plugin hooks (the solid transform and the opentui:runtime-module:* resolvers) for that import.

Before / After

Before: the TUI discovers ~/.config/opencode/plugins/tui/pr-indicator.tsx and imports it as pr-indicator.tsx?mtime=1786494961337.0317. OpenTUI's runtime plugin support never sees the import, so the JSX pragma falls through to Bun's native transpiler, which emits import "@opentui/solid/jsx-dev-runtime". That specifier resolves via ordinary node_modules walking from the plugin's own directory:

• global config dir (no node_modules): hard failure — toast Plugin: Cannot find module '@opentui/solid/jsx-dev-runtime', plugin never loads
• project dir inside a repo with @opentui/solid installed: loads a second solid instance, so the plugin renders once but host-store reactivity silently breaks

After: the specifier is pr-indicator.tsx?mtime=1786494961337. Runtime plugin hooks fire, JSX and solid imports rewrite to the host's embedded runtime modules, and the same plugin loads and stays reactive from any discovery directory.

Verified against a minimal compiled repro (ensureRuntimePluginSupport() + dynamic import) built with the production build options: the fractional query fails deterministically, the truncated query loads, on both plain and minify + splitting + solid-plugin builds.

How

• packages/tui/src/plugin/discovery.ts: freshSpecifier truncates the mtime to whole milliseconds before appending it, in both the Bun and Node branches, with a comment pinning why. Cache-bust granularity coarsens from sub-millisecond to 1ms, matching the core plugin supervisor (Date#getTime()); the watcher's 100ms reconcile debounce makes a same-millisecond staleness miss unreachable in practice.
• packages/tui/test/plugin-discovery.test.ts: regression test asserting a fractional mtimeMs produces a dot-free query.

Scope

• Does not touch the underlying Bun behavior: a dependency-free repro shows Bun.plugin onResolve/onLoad are silently bypassed whenever the import specifier's text after its last dot starts with a non-letter (?mtime=123.456), in plain bun and compiled binaries alike — it only surfaces as a hard failure in compiled binaries because the natively transpiled output can't resolve host packages. Reported upstream as Runtime Bun.plugin onResolve/onLoad silently bypassed when import query string contains a dot followed by a non-letter (e.g. ?mtime=123.456) oven-sh/bun#37699; this fix removes the only place we generate such specifiers.
• Does not change how plugin load failures surface (toast only, no dialog row) — separate UX question.

Testing

• bun test test/plugin-discovery.test.ts — new regression test passes.
• bun test in packages/tui — 661 pass / 0 fail.
• bun typecheck in packages/tui — clean after rebasing onto v2 with fix(core): restore bundler resolution for source-imported deps #41885 (an earlier v2 HEAD breakage made the first CI run fail; unrelated to this change).
• End-to-end: compiled repro binary loads a real-world JSX plugin (~/.config/opencode/plugins/tui/pr-indicator.tsx) with the truncated specifier and fails with the fractional one.
• Independently reviewed pre-merge: version-equality semantics in the plugin registry, 1ms granularity risk, Node-branch URL safety, Windows test behavior, and blast radius (the only other ?mtime= builder, core's plugin supervisor, already interpolates integers).

sequenceDiagram
    participant R as TUI reconcile
    participant B as Bun module loader
    participant P as runtime plugin hooks
    R->>B: import plugin.tsx?mtime=...337.0317
    Note over B,P: before: hooks skipped (dot in query)
    B-->>R: Cannot find module '@opentui/solid/jsx-dev-runtime'
    R->>B: import plugin.tsx?mtime=...337
    B->>P: onLoad / onResolve fire
    P-->>B: rewrite to opentui:runtime-module:*
    B-->>R: plugin loaded against host solid