chore(release): v0.4.63

[entelecheia]

Version surfaces bumped to 0.4.63 and CHANGELOG updated. No code changes.

Ships two user-facing fixes that the Phase 3 real-app smoke uncovered, plus the
hwp-editor backend bridge.

• Evidence Binder mutations were rejected at the IPC bridge. The payload is
  camelCase; the Rust enum renamed only its variants and still expected
  snake_case fields, so link / unlink / targets / note / verified /
  include-in-submission all failed before doing anything. Regression tests now
  pin every mutation wire shape.
• Opening a document with evidence candidates froze the window. Discovery
  deep-inspected every match on the UI thread before applying any bound: over 40
  seconds above 98% CPU on a 64,744-file workspace. Now about 4 seconds, off the
  UI thread, with the window responsive.
• The hwp-editor engine bridge (six hwped_* commands) is backend only; no Maru
  surface uses it yet.

Everything else merged since v0.4.62 is internal and deliberately absent from
the changelog per its stated convention: GSD planning onboarding (#275), the
verification gate set (#276), the shared scanner and path invariants (#277), and
the typed IPC error contract (#279). All are behavior-preserving.

make release-version-check RELEASE_TAG=v0.4.63 passes; the skills bootstrap
snapshot verifies at 36 skills.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.