docs(decisions): restructure into pql governance DQR tree

Phase 1 of the pql migration. Moves the flat decisions/*.md layout into
governance/{decisions,questions,rejected}/<domain>.md — the tree pql's
`decisions sync` parses natively (record type from subdir, domain from
filename stem). Proven against pql 1.6.2: sync reports 357 records
(237 D / 108 Q / 12 R), 1057 refs, broken: 0; validate ok.

- 6 D-domain files -> governance/decisions/ (git renames)
- 5 questions-<domain>.md -> governance/questions/<domain>.md (prefix dropped)
- rejected.md split by domain -> governance/rejected/{architecture(R-001..010),
  economics(R-011),perception(R-012)}.md
- decisions/README.md + questions.md index folded into governance/README.md;
  pql's `decisions sync` now auto-maintains the record index appended below
  the hand-written domain guidance (no more manual ID-list table upkeep).
- .pql/config.yaml: canonical vault config (tracked, not ignored).

Link rewrites are token-preserving: only the relative `foo.md` path portion
changes (e.g. `rejected.md#r-011` -> `../rejected/economics.md#r-011`); every
`[D-NNN]` bracket text and `#anchor` stays byte-identical, so pql's reference
extraction is unaffected. The one-shot transform is committed at
tooling/pql-migrate/restructure_decisions.py for provenance.

Codebase path references to decisions/ (CLAUDE.md, rules, skills, docs) are
updated in a follow-up commit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.pql/config.yaml

@@ -0,0 +1,35 @@
+# pql configuration for The Settled Reach.
+# Decision/question/rejected records live under governance/{decisions,questions,rejected}/
+# (pql's DQR tree); the vault is the whole repo.
+
+# Frontmatter dialect: yaml | toml.
+frontmatter: yaml
+
+# Wikilink dialect: obsidian | pandoc | markdown.
+wikilinks: obsidian
+
+# Where to draw tag information from: any subset of [inline, frontmatter].
+tags:
+  sources: [inline, frontmatter]
+
+# Glob patterns to exclude from indexing. Built-in defaults (.git/, .pql/,
+# sqlite sidecars) are always honoured. Use .pqlignore for richer rules.
+exclude:
+  - "**/.obsidian/**"
+  - "**/node_modules/**"
+
+# Per-vault ignore files the indexer consults when walking. Default follows
+# .gitignore so pql piggy-backs on what the repo already excludes (build
+# outputs, vendored deps, the rebuildable .pql/*.db).
+ignore_files: [.gitignore]
+
+# Populate file.gitmtime / file.gitauthor from git log.
+git_metadata: false
+
+# Build an FTS5 index of note bodies. Off by default; only worth turning on
+# if you actually use 'body MATCH ...' queries.
+fts: false
+
+# Optional aliases — short names usable as PQL macros.
+# aliases:
+#   members: "type = 'council-member'"