docs: Correct dead paths and stale claims in repository instructions

[tablackburn]

Summary

instructions/repository-specific.instructions.md had accumulated references that no longer
resolve against the repository. An agent following them lands on nothing, or on a wrong answer.
This corrects them and audits the rest of the file and AGENTS.md for the same class of defect.

Repository-owned fixes (this PR)

instructions/repository-specific.instructions.md is the only file changed. Evidence for each fix:

Was	Evidence it is wrong
Migration guide cited as docs/migration/v0.8-to-v1.0.md	ls docs/ returns exactly one file, migration-v0.8-to-v1.0.md. A hyphen, not a directory separator
Consumer example set $PSBPreference.Test.ScriptAnalysisEnabled	PowerShellBuild/build.properties.ps1 line 64 defines the nested ScriptAnalysis = @{ Enabled = ... }. README.md line 108 documents it as $PSBPreference.Test.ScriptAnalysis.Enabled. ScriptAnalysisEnabled is read by nothing in the module
Test workflow described as having a matrix, a ./build.ps1 -Task Test -Bootstrap command, and a DEBUG runner flag	.github/workflows/test.yml is 20 lines and defines one job that is uses: psake/.github/.github/workflows/ModuleCI.yml@main. Commit c2c184e replaced the inline job with that delegation. grep -rn DEBUG .github/ returns nothing
Remove-ExcludedItem named as the private helper	PowerShellBuild/Private/ also contains Get-PSBuildHelpLocale.ps1
Test file table listed five files, and called Meta.tests.ps1 script analysis	tests/ contains sixteen *.tests.ps1 files. Meta.tests.ps1 has one Describe 'Text files formatting' with File encoding and Indentations contexts, and invokes no analyzer
Output directory example pinned 0.8.0/	ModuleVersion in the manifest is 0.8.2. Replaced with <ModuleVersion> so it cannot drift again

Ownership: what was not touched, and why

instructions/update.instructions.md states under Content Preservation Rules that
"the file repository-specific.instructions.md must NEVER be copied from upstream", and
contributing.instructions.md states "local changes belong in
repository-specific.instructions.md - this file is never synced from upstream". The other
eleven files in instructions/ are listed in aim.config.json under modules.include and are
copied from the AIM template's instruction-templates/ folder on each sync, so a local edit to
any of them is silently reverted at the next sync.

The audit found no defects in the synced files. They contain no claims about this repository:
grep for PowerShellBuild, PlatyPS, AlphabeticParamsOrder, requirements, docs/,
tests/, and .github/ across them returns only generic guidance and hypothetical examples.
Nothing needs an upstream contribution.

The Last sync date in AGENTS.md is unchanged. update.instructions.md step 8 sets that field
only as part of a sync from the centralized repository, and this is not a sync.

Also verified clean

• requirements.pester-matrix.psd1: grep across instructions/, AGENTS.md, and
  CLAUDE.md finds no reference to the deleted file.
• Recent dependency moves: the psake 5.0.4 floor, the Pester 6.0.0 module floor and 6.1.0 pin,
  and Microsoft.PowerShell.PlatyPS 1.x are all already stated correctly and match
  requirements.psd1 and PowerShellBuild.psd1.
• Task and settings names: all 17 module-level tasks, all 8 repository-level tasks, all 15
  $PSB{TaskName}Dependency variables, and all 12 exported functions named in the file exist with
  the stated defaults.
• AGENTS.md matrix: all 12 files it routes to exist, and all 12 files in instructions/
  appear in it. No gaps in either direction.
• build.ps1 flags: -Bootstrap, -Task, -Help, and -PSGalleryApiKey all exist as documented.

Out of scope, reported not fixed

README.md lines 171 and 198 carry the same $PSBPreference.Test.ScriptAnalysisEnabled error the
instruction file copied, contradicting the README's own settings table 60 lines above. That is
user-facing documentation and belongs in its own pull request.

Test plan

• ./build.ps1 -Task Test - 483 passed, 0 failed, 3 skipped, matching the baseline
• Every path, task name, setting name, and function name asserted in the file checked against
  the repository rather than read for plausibility

Breaking changes

None. Internal agent documentation only, so no CHANGELOG entry.

Note on PR #186

Branch docs/readme-alphabeticparamsorder-drift also edits this file, removing
AlphabeticParamsOrder from the Docs settings row at line 75. That row is untouched here and
the two changes are on disjoint lines.

🤖 Generated with Claude Code

https://claude.ai/code/session_01U1Jhu7fgTRJq7LK5MuKteE

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Test Results

    4 files  ±0    760 suites  ±0   2m 29s ⏱️ +10s
  485 tests ±0    482 ✅ ±0   3 💤 ±0  0 ❌ ±0 
1 944 runs  ±0  1 877 ✅ ±0  67 💤 ±0  0 ❌ ±0 

Results for commit e49f979. ± Comparison against base commit a64ebc8.