[memtomem]

Closes #249
Closes #251

What changes

syncmill start gate discovery (#249)

• discover_gate_commands opened its well-known files by name. On a case-insensitive filesystem (the macOS default), opening makefile found Makefile, so a repository with only a Makefile showed make test as coming from makefile. The same applied to the other files: PACKAGE.JSON was read as package.json.
• It now lists the repository root once (os.scandir) and reads a file only when a directory entry has exactly its name. This covers pyproject.toml, package.json, GNUmakefile/makefile/Makefile (still in GNU make's order), Cargo.toml and go.mod.
• Each suggestion now names a file that is on disk, and the result is the same on every filesystem. A file stored under another capitalization is no longer suggested from on macOS, as on Linux. The existing _read safeguards (regular file, no symlink, bounded read) are unchanged.
• CHANGELOG: one Fixed entry under Unreleased.

Flaky TUI test (#251)

• test_details_and_compare_share_wording_with_the_cli_json checked the raw apply-blocker string inside the Details text. The blocker carries git's stderr. On a runner where git stops at a filesystem boundary that stderr is two lines; Details escapes the newline as \x0a, so the raw string no longer matched. That is the 3.14 failure on Send approved project lessons to Room rounds (#174) #250.
• The test now pins the source-check failure (repository_fingerprint raises a one-line or a two-line reason). It checks that the JSON keeps the raw reason and that Details shows each blocker as one escaped line (printable_name). Test-only, so no CHANGELOG entry.

Tests

• test_discovery_names_the_makefile_as_it_is_stored (Makefile / makefile / GNUmakefile) and test_discovery_ignores_a_file_whose_name_differs_only_in_case (5 files). Both make opening case-insensitive, so they bite on case-sensitive Linux too.
• test_discovery_reads_known_files_and_never_runs_them, which failed on macOS before, now passes.
• Mutation checks: dropping the exact-name guard fails 6 tests; reverting the TUI assertion to the raw-string check fails the two-line case.
• Full suite via suite-run: CLEAN, exit 0, no failures on macOS. ruff check . passes.
• Codex review, three rounds, all SHIP:
  • R1 had one Minor: the other discovery files had the same capitalization problem. Fixed here, at the maintainer's choice.
  • R2 (diff only) and R3 (after that change) had no findings.

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