Add a GitHub Issues backend to Pathfinder

Chart Step 1 now asks where the map should live: local files under
gitignored specs/ (the default) or a pathfinder:map issue whose decision
questions are its sub-issues, driven by gh. The pick is recorded as the
first Ground rules bullet and never re-asked; Auto-Discovery resolves
either backend, and an issue URL routes straight to github.

On github the local model maps onto the tracker's own primitives rather
than being simulated in issue bodies: sub-issues, native issue
dependencies for blocking, the assignee as the claim, one
pathfinder:<type>-<mode> label so type and mode cannot drift, and an
Answer comment plus a close reason that distinguishes a decision from a
question ruled out of scope. Both wiring calls key on the database id,
not the number. The map body therefore carries no checklist at all.

Sketches, secrets and the PLAN-DRAFT stay on local disk regardless --
plan2code-1-plan discovers its input with ls specs/ and has no notion of
a tracker. github is only offered after a five-check preflight, and the
offer names the repo's visibility, because a map on a public tracker
publishes the destination and the codebase recon. The Step 3 recon is
held until Step 6 so the no-fog off-ramp leaves no litter.

Depth lives in a seventh reference file; the orchestrator was
recompressed to absorb the new section within the 11,000 char limit by
removing duplication with its references. Adapted from the GitHub
tracker doc behind Matt Pocock's wayfinder skill (MIT).

AI Assisted
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# Trail Footer
> Loaded at the top of the skill. Read once; it applies to EVERY response in both modes. Defines the map visual and the pathed resume command that close each turn.
>
> **Backend note.** The glyphs, the two forms, and the discipline are identical either way. On `**Backend:** github` the inputs come from the sub-issue query rather than the checklist, and Form A's command is the map issue URL — see `github-issues.md`.
The trail is how a human with no memory of the last session sees, at a glance, how far the map has come and what is left — and copies the exact command to resume without hunting for a path that lives in gitignored `specs/`. It closes every response once a map exists.