Own the knowledge-index generator + index-aware review skills (#25)

* Make domain-skill knowledge discovery index-aware

The 6 AL domain review skills and read.md now enumerate candidate articles
from the BCQuality knowledge index (knowledge-index.json) instead of opening
every file under the domain folder to read its frontmatter. The worklist
selection predicate is unchanged (keywords intersect diff tokens, or topic
matches a changed object type) - only the discovery source changes, so the
same articles are selected. Full article bodies are read only for worklisted
entries.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Reconcile §Source wording with the lean knowledge index

The BCQuality filter now emits a lean index whose per-article description is a
one-line hint rather than the full verbatim Description. Update the six domain
skills' §Source to say the index carries a one-line description hint (keywords,
title, and a one-line description) instead of the full description. The
worklist selection predicate is unchanged: keywords drive selection and the
agent opens worklisted articles in full for their rule bodies.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Own the knowledge-index generator in BCQuality

The knowledge index is an acceleration of the skills' Source step, and its
schema is part of that contract — so BCQuality should own the generator rather
than each consumer re-implementing it. Add tools/Build-KnowledgeIndex.ps1 (the
parser + lean-description shaping + emit, lifted verbatim from the
BCAppsBCQuality filter prototype) and document the index in agent-consumption.md.

Consumers prune their clone to policy, then call this script; the index stays
in lockstep with the Source contract and every orchestrator gets the same
faithful index for free. The worklist selection predicate is unchanged.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Own knowledge-index generation in BCQuality (runtime + CI), not the consumer

The index is now produced by BCQuality itself: Entry's preparation step
rebuilds knowledge-index.json over the live, already-pruned clone at the start
of every run, and a new CI workflow validates the generator's health
(determinism, full coverage, selection-input integrity). Consumers no longer
invoke or know about the index.

Rebuilding over the pruned clone (vs shipping a committed full-corpus index)
keeps the index exact for any consumer policy: it can never list a denied
article, so policy-excluded rules cannot leak into discovery. READ now states
the index is discovery-only -- a finding must cite an article opened in full,
and rows whose file is absent are discarded before ranking.

- skills/entry.md: new 'Preparation -- knowledge index' precondition
- skills/read.md: index ownership + discovery-only invariant
- microsoft/skills/review/*.md (6): 'BCQuality builds' (not 'the filter emits')
- agent-consumption.md 5a: runtime+CI ownership rationale
- .github/workflows/knowledge-index.yml + scripts/Test-KnowledgeIndex.ps1: generator guard
- .gitignore: never commit the runtime index

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Make runtime index build non-interactive and self-contained

entry.md now gives the exact build command (pwsh ./tools/Build-KnowledgeIndex.ps1)
so the agent's preparation step is unambiguous, and the generator's -BCQualityRoot
parameter is optional (defaults to the clone root) so it runs in non-interactive
-p mode without prompting.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Resolve knowledge-index root to absolute path (cross-platform fix)

Get-ChildItem.FullName is always absolute, so deriving the relative article
path via Substring(\.Length) requires an absolute root. A relative root
such as '.' (used by the CI guard's 'Test-KnowledgeIndex.ps1 -Root .') left the
full path almost intact on Linux, producing bogus 'home/runner/.../knowledge'
paths and failing the coverage check. Normalise both the generator's
-BCQualityRoot and the test's -Root with Resolve-Path before use.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>

microsoft/skills/review/al-privacy-review.md

@@ -20,7 +20,7 @@ An orchestrator invokes this skill with either a `pr-diff` (the standard PR-revi
 
 ## Source
 
-Collect all knowledge files under `*/knowledge/privacy/**/*.md`, across every enabled layer (`/microsoft/`, `/community/`, `/custom/`). Relevance trims the result to the subset that applies.
+Read the BCQuality knowledge index once — the `knowledge-index.json` BCQuality builds at the root of the knowledge checkout (Entry's preparation step regenerates it over the live, already-filtered clone — see `skills/entry.md`). It lists every article that survived layer and allow/deny filtering and carries, per article, its `path`, `layer`, `domain`, frontmatter dimensions, `keywords`, `title`, and a one-line `description` hint — exactly the fields Relevance and Worklist consume. Take the index entries whose `domain` is `privacy` as this skill's candidate set across every enabled layer; do not open the individual article files at this step. Open an article's full body only once it enters the Worklist below, so a review reads the index plus the handful of worklisted articles instead of every file under `*/knowledge/privacy/**`.
 
 ## Relevance
 
@@ -41,7 +41,7 @@ Narrow the relevant files to the subset that applies to the changes under review
 - The changed procedures and triggers, weighted toward those that call `Error`, `Session.LogMessage`, `StrSubstNo`, `GetLastErrorText`, `FeatureTelemetry.LogUsage`/`LogUptake`/`LogError`, `HttpClient.Post`/`Get`, `IsolatedStorage.Set`/`SetEncrypted`/`Get`, or `PrivacyNotice.GetPrivacyNoticeApprovalState`.
 - Tokens extracted from the diff that relate to privacy (`DataClassification`, `CustomerContent`, `EndUserIdentifiableInformation`, `EndUserPseudonymousIdentifiers`, `SystemMetadata`, `ToBeClassified`, `PrivacyNotice`, `GetLastErrorText`, `TelemetryScope`, `FeatureTelemetry`, `CustomDimensions`, `LogUsage`, `LogUptake`, `LogError`, `HybridSL`, `HybridGP`, `HybridBC`).
 
-A file enters the candidate worklist when its `keywords` intersect the extracted tokens or its topic (derived from filename and Description) matches a changed object type.
+A file enters the candidate worklist when its `keywords` intersect the extracted tokens or its topic (derived from the index entry's `path`, `title`, and `description`) matches a changed object type. Read an article's full file — its `## Best Practice` / `## Anti Pattern` bodies — only after it makes the worklist; candidate selection uses the index alone.
 
 Once the candidate worklist is known, resolve layer-precedence conflicts per READ. Drop lower-precedence files whose normative guidance (`## Best Practice` or `## Anti Pattern`) directly contradicts a higher-precedence candidate, and record each dropped file in `suppressed` with `reason: "layer-precedence"`. Files that would have been candidates but are hidden because their layer is disabled in consumer configuration are recorded with `reason: "configuration"`. Files that never became candidates are NOT recorded in `suppressed`.