chore(server): log and bound instance service bootstrap

[CannonRS]

Issue for this PR

Closes #46166

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

InstanceBootstrap.run in packages/opencode/src/project/bootstrap.ts awaits init() on
each per-instance service (lsp, share, format, vcs, snapshot, project) inside an
Effect.forEach with concurrency: "unbounded". Each init was unbounded, the previous
catchCause only fired on rejection, and there was no per-service log line, so a single
misbehaving service could swallow the warning, and there was no signal at all on a hang.

This PR keeps the concurrency shape (unbounded, all services start in parallel) and adds:

• A 10-second Effect.timeout around each individual service.init(). On timeout the
  service's init is interrupted, the rest of the bootstrap continues, and a
  logWarning("instance service init failed", { service, cause }) is emitted.
• A per-service logInfo start and finish line ("instance service init started" /
  "instance service init completed") so the bootstrap log is navigable.
• A single logInfo("bootstrap completed", { directory }) at the end so callers can
  confirm the layer reached the steady state.

The 10-second budget is a deliberate trade-off: a healthy service init is bounded by
local state materialization and should return in well under a second; 10 seconds is large
enough not to fire on slow disks, small enough that a hung init does not block the rest
of the bootstrap indefinitely. The previous behaviour was effectively "unbounded", so
this is strictly more recoverable, never less.

How did you verify your code works?

• Single file: packages/opencode/src/project/bootstrap.ts, +16/-2.
• bun typecheck in packages/opencode passes (tsgo --noEmit exit 0) after
  bun install in the worktree, against upstream/dev head dc4449df0d plus this commit.
• Manually traced: bootstrap.run is the only caller of the listed services' init() in
  this layer; the new Effect.timeout is scoped to that one Effect.forEach body. The
  outer Effect.withSpan("InstanceBootstrap.init") and the Effect.withSpan on run
  are unchanged, so the trace tree stays the same.

Screenshots / recordings

N/A — server-side, no UI change.

Checklist

• I have tested my changes locally
  • bun typecheck in packages/opencode passes (tsgo --noEmit exit 0) after
    bun install in the worktree, against upstream/dev head dc4449df0d plus this commit.
• I have not included unrelated changes in this PR