docs: adopt workspace-wide agent standards and retire sow-docs

Scaffold the per-repo configuration the engineering skills expect, and put
the three-way split of work into standing law:

- Live work -> wayfinder maps + Gitea issues (closeable, assignable,
  queryable).
- Settled decisions -> ADR files in docs/adr/ (immutable, findable, never
  closed).
- Standing law -> DOCTRINE.md / AGENTS.md / CONTEXT.md.

Adds docs/agents/{issue-tracker,triage-labels,domain}.md and an
"Agent skills" section in AGENTS.md. The tracker doc records Gitea via the
tea CLI, the wayfinder map/ticket/blocking operations, and the rule that
issues follow ownership: file work in the repo that owns it, not the one you
happen to be standing in.

ADR-0001 (markdown is reference, law, or an ADR - nothing else) is adopted
from sow-codebase so the rule is local to every repo.

sow-docs is retired: its 35 decisions become ADRs in the repos that own them,
its living docs move to sow-platform and sow-assets-manifest, and its
unfinished intent becomes Gitea issues.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/adr/0002-sow-tools-becomes-the-crucible-suite.md

@@ -0,0 +1,12 @@
+# ADR-0002: `sow-tools` becomes the Crucible suite
+
+- **Status:** Accepted
+- **Date:** 2026-06-11
+- **Migrated from:** `sow-docs` `07-decisions-log.md` entry **D11**, on the
+  retirement of `sow-docs`. Content is the original decision, unchanged.
+
+- **Decision:** Rename the future toolchain surface to Crucible: one Go module,
+  multiple `cmd/` binaries, plus a dispatcher so wrapper commands can stay
+  stable.
+- **Rationale:** Depot, HAK, module, topdata, and wiki tooling share internals
+  but have different command surfaces. One module avoids premature repo splits.