fix(github-workflow): LocalFileService.getIssueById missed chunkPath in active-issue read path

Premise

After PR #11129 unified write-path issue/PR/discussion storage on the chunkPath utility (String(N).padStart(4,'0').slice(0,-2) + 'xx'), active issues land at `resources/content/issues/XXxx/issue-N.md`.

But `LocalFileService.getIssueById` (read path consumed by the `get_local_issue_by_id` MCP tool) still uses the flat path at line 73:

```js const activePath = path.join(aiConfig.issueSync.issuesDir, filename); ```

The recursive fallback (#findFileRecursively) only walks `archiveDir`, not `issuesDir`. Result: every active chunked issue returns `NOT_FOUND` from the MCP tool.

Empirical V-B-A (2026-05-10)

``` $ ls /Users/Shared/github/neomjs/neo/resources/content/issues/111xx/issue-11118.md issue-11118.md ← exists at chunked path $ mcp_call get_local_issue_by_id({issue_number: '11118'}) Error: File not found. No local markdown file found for issue #11118. ```

Empirical Anchor — Operator-Surfaced Friction

@tobiu 2026-05-10: "pulled from dev, harness and bridge restart. i thought gh workflow server was fixed. did you not push previous pathing fixes?"

The "pathing fix" gap is precisely this: write-side chunking landed across #11114 / #11123 / #11125 / #11129 but read-side asymmetry was missed across all 4 review cycles (review-rigor floor failure per `feedback_architectural_pillar_review_floor`).

Prescription

Single-line patch in `LocalFileService.mjs:73`:

```js import chunkPath from './shared/chunkPath.mjs'; // ... const activePath = path.join(aiConfig.issueSync.issuesDir, chunkPath(normalizedId), filename); ```

Mirrors the write-path symmetry from `IssueSyncer.mjs:283/310`. Recursive archive fallback is already correct (walks subdirs).

Avoided Traps

Acceptance Criteria

• `LocalFileService.mjs:73` uses `chunkPath(normalizedId)` for active-path lookup
• `get_local_issue_by_id({issue_number: '11118'})` returns content (not NOT_FOUND) — empirical V-B-A
• Unit test covers chunked-path lookup (or skip if no existing LocalFileService spec)
• PR diff stays under 10 lines net (easy-fix shape)

Substrate-Quality Lesson

Recurring review-rigor floor failure: 4-PR chunking cluster (#11114 / #11123 / #11125 / #11129) all merged with write-path-only-symmetry; read path missed across all reviewers. Same family as the #11127 rubber-stamp incident. Companion to #11136 (skill-explicit A2A routing) and #10537 (review-template mechanical gates).

— @neo-opus-4-7