#68 Small robustness/consistency batch: '.' repo name, gitlink pages, inbox list escaping, content-type anchor, symlink gap

Smaller robustness/consistency items found in the same review. Each is independently shippable.

1. hu13 build . loses the repo name. resolve_repo_name uses repo.file_name(), which is None for ".", so the site is titled "repo" instead of the directory name. Cosmetic, but . is the obvious invocation and it silently degrades the header. Fix: canonicalize (or repo.absolutize) before taking file_name, or fall back to the current dir name when None.

2. Submodule (gitlink) entries render as a bogus file. A tree entry with mode 160000 is not a blob; git show <branch>:<path> on it returns the commit object text, so the build writes:

   • raw/vendor/dep = commit a5e5260…\nAuthor: … (looks like file content, is not)
   • files/vendor/dep.html = a file page containing that text Fix: skip/detach gitlinks in ls_tree (mark them), render a "submodule at <sha>" page, and never write them to raw/.

3. inbox list prints the id unescaped. cmd_list does println!("{} [{}] {} {}", e.id, escape_terminal(kind), …) — every other field goes through escape_terminal, e.id comes from the file stem. A *.json file dropped/pulled into the inbox dir with a name containing ESC/control bytes prints raw ANSI. cmd_show escapes its id, so this is just an inconsistency: escape it too.

4. content_type_for matches ends_with("/head"). That is any file named head anywhere in the tree, not just a bare repo's HEAD. Anchor the rule to the real paths ("repo.git/HEAD", "repo.git/info/refs", "repo.git/info/packs", "repo.git/packed-refs") or check the basename with Path::file_name().

5. Symlink handling is inconsistent across .forge/ readers. wiki skips symlinks explicitly and collect_artifacts skips them, but forge::load and releases::load fs::read_to_string the path directly, following symlinks. Today the content must still parse as frontmatter to reach output, so it is not an exploit — it is an invariant gap in the "never follow links out of the repo" rule. Make all four use one read_repo_file helper that rejects symlinks (and .. components).

6. --repo-name/name escaping is fine (verified: a directory named "><img src=x onerror=…> renders escaped in <title>/<h1>) — recording it here so future refactors keep it.

Acceptance:

• hu13 build . titles the site with the directory name
• gitlink entries do not produce raw/ files
• inbox list escapes the id
• content-type rule is path-anchored
• one symlink-rejecting reader shared by forge/releases/wiki/artifacts