TASK-014: housekeeping — promote status from In Progress to Done

The PIMPL split landed in dea9c63 / 369c2a8 and all action items are
checked. Status was held at "In Progress" to flag the 27 unworked
review findings recorded in
specs/unworked_review_issues/2026-05-04_115707_task-014.md. Those
findings remain deferred (tracked in that file); the task itself is
complete and downstream tasks (015–026) build on it.

Also sync specs/tasks/_index.md row to Done.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: etr

specs/tasks/M3-request/TASK-014.md

@@ -29,4 +29,4 @@ Move `webserver`'s backend state (`MHD_Daemon*`, mutexes, ban set, connection ta
 **Related Requirements:** PRD-HDR-REQ-001..004
 **Related Decisions:** DR-002, DR-003b, §4.1
 
-**Status:** In Progress
+**Status:** Done

specs/tasks/_index.md

@@ -96,7 +96,7 @@ Nominally: **13 sequential tasks**, each S–XL. Most other tasks parallelize of
 | TASK-011 | `http_response` const-correct accessors | M2 | Done | TASK-009 |
 | TASK-012 | `http_response` fluent `with_*` setters | M2 | Done | TASK-009 |
 | TASK-013 | Remove `*_response` subclasses and dispatch virtuals | M2 | Done | TASK-009, TASK-010, TASK-011, TASK-012 |
-| TASK-014 | `webserver_impl` skeleton (PIMPL prep) | M3 | In Progress | TASK-002 |
+| TASK-014 | `webserver_impl` skeleton (PIMPL prep) | M3 | Done | TASK-002 |
 | TASK-015 | `http_request_impl` skeleton (PIMPL split) | M3 | In Progress | TASK-002, TASK-014 |
 | TASK-016 | Per-connection arena for `http_request_impl` | M3 | Done | TASK-014, TASK-015 |
 | TASK-017 | `http_request` container getters return `const&` | M3 | Done | TASK-015 |