docs(lanes): plan E2 — ccam lanes sync-base (E)
5 tasks: MIGRATIONS_DIR/GENERATED_MERGE_PATHS profile declarations, the lane-sync.js git core (check/merge/continue, ported against a real bare-origin fixture mirroring lane-sync-dev.sh's own test suite, plus a dedicated git-worktree fixture to catch the git-dir vs git-common-dir distinction MERGE_HEAD/info-attributes depend on), the sync-base route, the CLI subcommand, and the SKILL.md/docs edits that turn three "if it exists yet" conditionals into real instructions.
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