Feat/copilot cli skill parity rebased

[josealekhine]

Closes: #63

Combines two in-flight workstreams into one commit.

Docstring namespace sweep (parallel agent)

Follow-up to the CLI namespace cleanup in 78fbdf7. Updates
doc comments, blog posts, recipes, and the regenerated site to
reflect current command names (e.g. ctx pause → ctx hook pause,
ctx resume → ctx hook resume, ctx message → ctx hook message).
Also refreshes the Copilot CLI integration skills added in
edaac81 (PR #63) to match the new namespace.

Scope: ~450 files across docs/, site/, internal/cli, internal/write,
internal/config, .github/, integration skill templates, and .claude/
skill SKILL.md files.

Git push regex hardening (this session)

The block-dangerous-command hook's MidGitPush regex only matched
git push mid-command after ;, &&, or ||. This session
accidentally bypassed it with git -C <path> push — the permissions
deny list Bash(git push *) only matches prefix git push, so
git -C <path> push also slipped through.

Replace MidGitPush with a broader GitPush that covers:

• Bare git push at command start
• All separator and subshell entry points (;, &&, ||, |, &,
    (, $(, backtick, newline)
• Env-var and command-wrapper prefixes (GIT_DIR=/x git push,
    time git push, nice git push)
• Any flag shape between git and push (-C path, -c key=val,
    --git-dir=/path, --no-pager, --bare, -p, -P)
• Tail anchor that distinguishes subcommand from ref names
    (push-to-remote, push_branch) via [^a-zA-Z0-9._/-]|$

Documented trade-offs: accepted false positives on git log push
and git commit -m push (push as literal arg); known blind spots
for eval / sh -c quoting and shell aliases.

Adds internal/config/regex/cmd_test.go with 42 table-driven cases
covering all entry points, flag shapes, prefixes, negative cases
(other subcommands, ref-name continuations), and the accepted
false-positive classes.

Renames the Go symbol MidGitPush → GitPush to accurately
reflect scope; keeps legacy variant string mid-git-push and text
key block.mid-git-push (user-facing message is already generic:
"git push requires explicit user approval").

Spec: specs/git-push-regex-hardening.md
Spec: specs/cli-namespace-cleanup.md
Signed-off-by: Jose Alekhinne jose@parlakisik.com