refactor(decision-mapping): rename to wayfinding

Reframe the planning skill around the Wayfinder persona — chart a route
through a foggy problem, resolving tickets one at a time until the way to
the goal is clear. "Decision map" was jargony and inaccurate (only 1 of 4
ticket types is a decision).

Rename the folder and skill name, rewrite the description and framing, and
prune: unify node->ticket, bind "frontier" to the unblocked set, drop the
duplicated "one question at a time" (owned by /grilling), trim intro no-ops.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

skills/in-progress/README.md

@@ -2,7 +2,7 @@
 
 Skills that are still being developed. They're not ready to ship — expect rough edges, breaking changes, and abandoned experiments. They're excluded from the plugin and the top-level README until they graduate to a stable bucket.
 
-- **[decision-mapping](./decision-mapping/SKILL.md)** — Turn a loose idea into a sequenced map of investigation tickets, then drive them to resolution one at a time. User-invoked.
+- **[wayfinding](./wayfinding/SKILL.md)** — As the Wayfinder, chart a route through a foggy problem — turn a loose idea into a map of investigation tickets and resolve them one at a time until the way to the goal is clear. User-invoked.
 - **[loop-me](./loop-me/SKILL.md)** — Grill yourself into implementable workflow specs over multiple sessions, using the current directory as a stateful workspace. User-invoked.
 - **[wizard](./wizard/SKILL.md)** — Generate an interactive bash wizard that walks a human through a manual procedure (setup, a one-off migration, a state transition) — opening URLs, capturing values, writing `.env` and GitHub Actions secrets. User-invoked.
 - **[writing-beats](./writing-beats/SKILL.md)** — Shape an article as a journey of beats, choose-your-own-adventure style. Pick a starting beat, write only that beat, then pivot to the next, until the article reaches a natural end.