TASK-006: housekeeping (status + checkboxes)

Mark all five action items complete and set task status to Complete.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: etr

specs/tasks/M1-foundation/TASK-006.md

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+### TASK-006: Replace `#define` constants with `httpserver::constants`
+
+**Milestone:** M1 - Foundation
+**Component:** Public constants
+**Estimate:** M
+
+**Goal:**
+Eliminate macro pollution from public headers by moving every `#define` constant into `constexpr` declarations under the `httpserver::constants` namespace.
+
+**Action Items:**
+- [x] Inventory every `#define` in `src/httpserver/*.hpp` (`DEFAULT_WS_PORT`, `DEFAULT_WS_TIMEOUT`, `NOT_FOUND_ERROR`, `METHOD_NOT_ALLOWED_ERROR`, etc.).
+- [x] Create `src/httpserver/constants.hpp` defining each as `inline constexpr` of the appropriate type (`std::uint16_t` for ports, `std::string_view` for messages, etc.).
+- [x] Update internal callers (in `src/*.cpp`) to use `httpserver::constants::name` instead of the macro.
+- [x] Remove the `#define`s from public headers.
+- [x] Re-export `constants.hpp` from `<httpserver.hpp>`.
+
+**Dependencies:**
+- Blocked by: TASK-002
+- Blocks: TASK-033 (builder validation may reference port constants)
+
+**Acceptance Criteria:**
+- `grep -E '^\s*#define\s' src/httpserver/*.hpp` returns 0 lines (PRD §3.3 acceptance).
+- Existing tests that referenced the macros via `<httpserver.hpp>` still resolve through `httpserver::constants::*`.
+- Typecheck passes.
+- Tests pass.
+
+**Related Requirements:** PRD-CFG-REQ-002
+**Related Decisions:** §4.9
+
+**Status:** Complete