* feat(#1724): complete install write-confinement (copyWithPathReplacement, installCodexConfig)
ADR-1239 Phase B (parent #1679). PR #1706 (2a) confined the layout-driven
plan path and _copyStaged's inline guard; this completes the destSubpath
write-confinement acceptance criterion for the two remaining write sites
and canonicalizes _copyStaged.
- copyWithPathReplacement: new required confinementRoot param; a fail-closed
gate (assertDestWithinConfigHome + hasExistingSymlinkBetween) runs BEFORE
the rmSync/mkdirSync; root threaded through recursion + all 4 call sites
(stageRoot for pristine staging, targetDir for the 3 install sites); writes
go through the validated absolute path. Exported for behavioral testing.
- installCodexConfig: confines config.toml, agents/, and per-agent
agents/<name>.toml (name from agent frontmatter) via the canonical gate +
symlink-escape guard (parity with the other two functions).
- _copyStaged: fail-closed when configDir omitted (all callers pass it);
delegates strict-subpath to the canonical gate, keeps its symlink guard,
writes through the validated absolute path.
Reuses the existing assertDestWithinConfigHome (handles absolute dests via
path.resolve) and hasExistingSymlinkBetween — no new module. Behavioral
regression tests (escape/dest==root/fail-closed/symlink/name-injection),
red-first proven; cross-platform symlink tests use t.skip not bare return.
Closes#1724
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* chore(#1724): backfill changeset PR number (#1725)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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