Patch fixing a v2.36.0 regression caught by @voidborne-d.
What was wrong: skills/planning-with-files/scripts/init-session.sh was not updated when slug mode shipped in v2.36.0. Users installing via npx skills add or any of the nine IDE folder integrations received the old v2.0.0 script. The parallel plan isolation feature worked only if you cloned the full repo and ran the top-level script directly.
The same gap existed for the analytics template (--template analytics, v2.29.0) in the PS1 script, and the /usr/bin/env bash shebang fix from v2.35.1 had not propagated to IDE mirror check-complete.sh files.
What the fix does: Syncs init-session.{sh,ps1} and check-complete.sh from the canonical location into the skill directory and all nine IDE mirrors using the existing sync-ide-folders.py tool. Adds tests/test_canonical_script_sync.py with two assertions: byte-identical check between canonical and top-level scripts, and a sync-ide-folders.py --verify assertion to catch future drift in CI.
Thanks to @voidborne-d for catching this, providing grep proof, and adding the regression test.