docs: clear all 39 cold-build Sphinx warnings (truly green)

A `make docs-api-clean && make docs-api` cold rebuild now succeeds
with zero WARNING/ERROR lines (was 39).

Docstring fixes (RST hygiene — no semantic change):
- arborist/qa/{keys,runner,query,verify,quantifier,metacognition,dag,
  evidence}.py — add blank lines around indented blocks, convert
  ad-hoc indented sections to literal blocks (`::`), avoid line-broken
  inline literals (e.g. UNKNOWN_EVIDENCE_ID), and replace nested
  bracket/quote literals with cleaner wording.
- arborist/concepts/__init__.py — wrap function-signature listing in
  a literal block so bare `*` (kwarg marker) doesn't trip docutils.
- arborist/store.py — blank line before bullet lists in module +
  connect docstrings.
- arborist/evict.py — replace ad-hoc `{ ... }` enum block with prose.

Surface fixes:
- docs/_source/_ext/makefile_targets.py — escape `*` in auto-
  generated Makefile target descriptions (covers `*-parallel`,
  `*.dot`, `*.db`, `π*`, etc.) so the generator emits clean RST.
- docs/_source/index.rst, concepts.rst — extend title underlines
  to match title length.
- docs/_source/concepts.rst, v8-fork-score.rst — widen first column
  of grid tables so cells no longer overflow into the column margin.
- docs/_source/merkle-agi-v7w-spatial-temporal.rst — switch
  pseudocode JSON block from `code-block:: json` to `text` (the
  `<int32 x 3>` placeholders aren't valid JSON tokens).

Verification:
- make docs-api-clean && make docs-api → build succeeded, 0 warnings
- make test → 1588 passed, 28 skipped
- make chain-check-shards → 0 breaks across all 7 shards
- import-time SyntaxWarning escalation on edited modules → clean

docs/_source/_ext/makefile_targets.py

@@ -133,6 +133,13 @@ def parse_makefile(makefile_path: Path) -> dict[str, str]:
     return targets
 
 
+def _escape_rst(text: str) -> str:
+    # Bare `*` in description text (e.g. ``*-parallel``, ``*.db``,
+    # ``π*``) trips the docutils inline-emphasis scanner. Escape every
+    # asterisk so it renders literally.
+    return text.replace("*", r"\*")
+
+
 def generate_rst(all_targets: dict[str, str], output_path: Path) -> None:
     """Write a single RST page grouping every target by workflow phase."""
     lines = [
@@ -174,7 +181,7 @@ def generate_rst(all_targets: dict[str, str], output_path: Path) -> None:
         lines.append("     - Description")
         for name, desc in present:
             lines.append(f"   * - ``make {name}``")
-            lines.append(f"     - {desc}")
+            lines.append(f"     - {_escape_rst(desc)}")
         lines.append("")
 
     # Surface anything we forgot to categorize so it shows up in review.
@@ -196,7 +203,7 @@ def generate_rst(all_targets: dict[str, str], output_path: Path) -> None:
         lines.append("     - Description")
         for name, desc in sorted(leftover):
             lines.append(f"   * - ``make {name}``")
-            lines.append(f"     - {desc}")
+            lines.append(f"     - {_escape_rst(desc)}")
         lines.append("")
 
     output_path.write_text("\n".join(lines), encoding="utf-8")

docs/_source/concepts.rst

@@ -7,7 +7,7 @@ documents. This page is the orientation: what the system is, the
 core abstractions you'll see in code and docs, and how they compose.
 
 What arborist is
----------------
+----------------
 
 A reference implementation of two papers stacked:
 
@@ -103,13 +103,13 @@ Every answer carries two stacked labels.
 **Schema layer** — v9.8 trichotomy, persisted, drives cache lookups
 and the audit chain:
 
-============= =============================================================
+============== =============================================================
 ``audit_mode`` meaning
-============= =============================================================
-STRICT        every evidence unit verifies against context
-HYBRID        some claims source-grounded, some emerged from training
-UNGROUNDED    no evidence, or none verifies — purely emergent
-============= =============================================================
+============== =============================================================
+STRICT         every evidence unit verifies against context
+HYBRID         some claims source-grounded, some emerged from training
+UNGROUNDED     no evidence, or none verifies — purely emergent
+============== =============================================================
 
 **Display layer** — four-rung ladder for claim-lattice modes only;
 renderer-only transformation, schema unchanged:

docs/_source/index.rst

@@ -1,5 +1,5 @@
 Arborist API Reference
-=====================
+======================
 
 Generated from docstrings. Replaces the static modules.md.
 

docs/_source/merkle-agi-v7w-spatial-temporal.rst

@@ -167,7 +167,7 @@ Transform commitment shape (4×4 SE(3) homogeneous matrix,
 rotational components quantized via SO(3) → axis-angle integer
 encoding):
 
-.. code-block:: json
+.. code-block:: text
 
    {
      "kind": "frame_transform",

docs/_source/v8-fork-score.rst

@@ -44,15 +44,15 @@ landed under the 2026-05-08 ``fbd99a8`` review:
 Verdict thresholds
 ------------------
 
-==========================  ==================  ============
-Score / flags                Verdict             CLI exit
-==========================  ==================  ============
-``score >= SIGNAL_FLOOR``    **ACCEPT**          ``0``
-``[0, SIGNAL_FLOOR)``        **MARGINAL**        ``0``
-``score < 0``                **REJECT**          ``1``
-hard-regression flag         **REJECT**          ``1``
-``NEG_INF_REGRESSION`` flag  **REJECT**          ``1``
-==========================  ==================  ============
+============================  ==================  ============
+Score / flags                 Verdict             CLI exit
+============================  ==================  ============
+``score >= SIGNAL_FLOOR``     **ACCEPT**          ``0``
+``[0, SIGNAL_FLOOR)``         **MARGINAL**        ``0``
+``score < 0``                 **REJECT**          ``1``
+hard-regression flag          **REJECT**          ``1``
+``NEG_INF_REGRESSION`` flag   **REJECT**          ``1``
+============================  ==================  ============
 
 ``SIGNAL_FLOOR`` defaults to ``0.05`` (5pp; matches
 :file:`docs/bench-maxing.md`'s noise floor).