fix(workflows): recompile standard locks with gh-aw v0.86.2 (#849)

The `Install GitHub Copilot CLI` step now takes the toolcache-hit path on
runner image 20260810.271.1+, which bakes in copilot-cli 1.0.78 (inside the
14-day TTL). `activate_cached_copilot_bin()` only appends the toolcache dir
to `$GITHUB_PATH` — it never stages a binary at `/usr/local/bin/copilot`.

Locks compiled with gh-aw v0.85.4 spawn the agent by that hardcoded absolute
path, so the agent job dies immediately with:

    spawn /usr/local/bin/copilot ENOENT

gh-aw v0.86.2 fixes this by resolving the CLI from PATH and staging it at
`${RUNNER_TEMP}/gh-aw/bin/copilot` before invoking AWF. v0.86.2 has now been
promoted to stable, so recompile the two standard workflows onto it; the
`*-standalone.lock.yml` smokes were already there.

Co-authored-by: GitHub Ace <githubnext@users.noreply.github.com>
Co-authored-by: David Slater <12449447+davidslater@users.noreply.github.com>

Author: davidslater