feat: add AdaL platform support

[Ricardoran]

Why this belongs in Graphify

AdaL supports discoverable SKILL.md files, project instructions through
AGENTS.md, and blocking-capable PreToolUse command hooks. This adapter gives
AdaL users Graphify's query-first workflow through a one-command install without
introducing a second orchestration pipeline.

Summary

• add AdaL as a first-class graphify install --platform adal target
• install a compact Graphify skill at ~/.adal/skills/graphify/SKILL.md or
  ./.adal/skills/graphify/SKILL.md
• merge Graphify-owned search/read guards into ~/.adal/settings.json
• add graphify adal install / uninstall, including project and strict modes
• document AdaL in the supported-platform and hook sections

Scope

The AdaL skill intentionally delegates to Graphify's stable CLI/query surface.
It does not add a new skillgen platform, generated references, or expected
snapshots. Native AdaL semantic orchestration can be considered independently
later; this PR stays focused on installation, graph-first querying, and hooks.

User-scope hooks match AdaL's lowercase tool names:

• bash|grep → graphify hook-guard search
• read_file|glob → graphify hook-guard read

Project installs remain project-scoped. Because AdaL currently loads lifecycle
hooks from user settings only, --project writes the project skill and
AGENTS.md guidance without changing ~/.adal/settings.json.

Configuration safety

• settings updates are idempotent and atomic
• existing file permissions and unrelated settings/hooks are preserved
• malformed shared JSON is refused rather than overwritten
• uninstall structurally matches only Graphify's exact executable, matcher, and
  hook-guard arguments

Validation

• focused installer/hook suite: 179 passed
• packaging/reference suite: 148 passed, 1 skipped
• full suite: 3,646 passed, 3 skipped
• Ruff passed on changed Python files
• all five skillgen CI guards passed
• graphify update . completed successfully