Repoint nine skill references that resolved from nowhere

[johnml1135]

Nine cross-references in the Avalonia migration and WinApp skills pointed at nothing. An agent following one — lessons-learned.md sending you to references/architecture-patterns.md, say — got a miss and carried on without the guidance it was told to read.

Start here: .claude/skills/fieldworks-winforms-to-avalonia-migration/references/lessons-learned.md — three of the nine are in that one file, and the shape is identical in all nine.

Where to look:

• Every target exists. Only the paths were wrong. They were written relative to the skill root while the citing file lives inside references/, so references/architecture-patterns.md resolved to references/references/architecture-patterns.md.
• Seven become plain sibling names — what a file inside references/ needs to reach the file next to it.
• Two genuinely cross skill boundaries and become repo-root paths: winforms-avalonia-parity.md cites parity-evidence.md in the migration skill, and architecture-patterns.md cites style-system.md in the Avalonia UI skill. Those two were never fixable as siblings.
• Nothing else changed. No prose, no guidance, no renames, no moves. 8 insertions, 8 deletions across 6 files.

Deliberately not here: no checker is added to stop this recurring. Worth doing, but it belongs with whoever owns skill tooling rather than bolted onto a path fix.

Verification: every reference in every .claude markdown file was resolved from the directory it is written in — nine dangling before, zero after. gitlint clean. No build.ps1 or test.ps1: markdown only, no compiled code.

Next: review and merge — independent of #1098/#1099/#1100/#1101 and touches none of their files.

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The nine, and where each now points

Citing file	Was	Now
fieldworks-winapp/navigation/winforms-avalonia-parity.md	references/parity-evidence.md	.claude/skills/fieldworks-winforms-to-avalonia-migration/references/parity-evidence.md
fieldworks-winapp/references/research.md	references/how-to-update.md	how-to-update.md
…migration/references/architecture-patterns.md	fieldworks-avalonia-ui/references/style-system.md	.claude/skills/fieldworks-avalonia-ui/references/style-system.md
…migration/references/control-exemplar-map.md	references/lessons-learned.md	lessons-learned.md
…migration/references/lessons-learned.md	references/architecture-patterns.md	architecture-patterns.md
…migration/references/lessons-learned.md	references/migration-checklist.md	migration-checklist.md
…migration/references/lessons-learned.md	references/parity-evidence.md	parity-evidence.md
…migration/references/migration-checklist.md	references/lessons-learned.md	lessons-learned.md
…migration/references/migration-checklist.md	references/seam-catalog.md	seam-catalog.md

How these were found

Not by reading. They surfaced while verifying that a different change — the skill compression in #1100 — had not broken any pointers. The check resolves every path-like .md reference inside .claude from the directory of the file that writes it, and reports the misses.

That check found one genuine regression introduced by #1099 (fixed there) and these nine, which predate all of this work. They are split into this PR precisely because they are unrelated to it: an unrelated fix riding along in a compression PR is how a reviewer loses track of what they approved.

The same check is what verifies this PR. It is currently a throwaway script rather than something in CI — see "deliberately not here" above.

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   11m 12s ⏱️ +12s
5 853 tests ±0  5 772 ✅ ±0  81 💤 ±0  0 ❌ ±0 
5 862 runs  ±0  5 781 ✅ ±0  81 💤 ±0  0 ❌ ±0 

Results for commit a9cb7cd. ± Comparison against base commit 6f72671.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.34%. Comparing base (6f72671) to head (a9cb7cd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1102   +/-   ##
=======================================
  Coverage   38.33%   38.34%           
=======================================
  Files        1507     1507           
  Lines      350580   350580           
  Branches    40293    40293           
=======================================
+ Hits       134410   134415    +5     
+ Misses     186941   186937    -4     
+ Partials    29229    29228    -1     

see 4 files with indirect coverage changes

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[johnml1135]

Consolidated into #1100 by cherry-pick; the commit is preserved verbatim there. Closing.