docs(6209): calibration stamp, after-write hook, usage seam, work log, duplicates, skill structure, tuning and rulebook routes, kind surface, prompt filter, moments, strict args, auth, lesson write path

Fourteen more test files: docstrings state the failure each guard defends
as a present-tense shape instead of the incident that found it, and issue,
milestone and rule numbers leave comments and assertion messages.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_skill_structure.py

@@ -1,4 +1,4 @@
-"""Every bundled skill keeps the shape Agent Skills can load well (#4398).
+"""Every bundled skill keeps the shape Agent Skills can load well.
 
 WHY THIS EXISTS
 
@@ -8,11 +8,10 @@ keep the SKILL.md body under 500 lines, split into reference files as it
 nears that, and link each reference file ONE level deep from SKILL.md —
 Claude may only preview a file reached through another reference file.
 
-using-scribe reached 478 lines because every new practice lands there, the
-same squeeze `_INSTRUCTIONS` was in before #4389. It was split: what matters
-on most turns stays in SKILL.md, what matters at one moment (placing a rule,
-a missed retrieval, starting a project) moved to files SKILL.md names with
-the moment to open them. These tests keep that shape from quietly undoing
+using-scribe grows because every new practice lands there. What matters on
+most turns stays in SKILL.md; what matters at one moment (placing a rule, a
+missed retrieval, starting a project) lives in files SKILL.md names with the
+moment to open them. These tests keep that shape from quietly undoing
 itself.
 
 WHAT IT PINS
@@ -71,8 +70,8 @@ def test_every_skill_md_fits_its_budget():
                         SKILL_LINE_BUDGET)
     assert not found, (
         f"SKILL.md over {SKILL_LINE_BUDGET} lines: {found}. Move what matters at "
-        f"one moment into a reference file SKILL.md links with that moment "
-        f"(#4398), rather than raising the budget toward 500."
+        f"one moment into a reference file SKILL.md links with that moment, "
+        f"rather than raising the budget toward 500."
     )
 
 
@@ -102,7 +101,7 @@ def test_long_reference_files_open_with_contents():
 
 
 def test_the_guards_can_fail():
-    """Rule 167: each guard bites on the failure it exists for."""
+    """Each guard bites on the failure it exists for."""
     assert over_budget({"s": "x\n" * 400}, SKILL_LINE_BUDGET) == ["s: 400 lines"]
     assert unlinked("see [a](a.md)", ["a.md", "b.md"]) == ["b.md"]
     assert nested({"a.md": "then [b](b.md)"}) == ["a.md → b.md"]