v0.1.10 — Audit Cycle 4 closure

Security:
- C1 control-byte terminal escape-injection bypass closed (GAP-0074)
- 8-bit/zero-padded bracketed-paste marker pastejacking closed (GAP-0075)
- enterRawMode restores terminal on mid-setup failure (ADV-002/#147)
- i64 bracket-depth counters (GAP-0076)

Fixed:
- Paste and Vi operator edits are undoable (#146)
- Config.max_history honored (#149)
- handleSearch resilient to transient I/O (#153)
- SIGTSTP/SIGCONT suspend-resume terminal handling (#155)
- cursor<=len invariant asserted (#151); killRange dedup (#154)
- Fixed pre-existing test that deadlocked zig build test's --listen runner

zig build test: 358 tests green (Debug + ReleaseSafe).