feat: installer v2 — selective install, interactive TUI, consolidate cluster

One coherent, dependency-free installer (bash 3.2+, zero deps) that
consolidates 7 conflicting install.sh PRs and fixes #532.

Selective install (compose freely; empty = everything):
- --division / --agent / --agents-file filter across both source tools and
  the flat converted outputs via a slug-based allow-set (#157, #487)
- --list [tools|teams|agents] and --dry-run

Install mechanics:
- --link symlink vs copy (#233); --path + env-var fallbacks (#216);
  auto-run convert.sh when integration files are missing (#426);
  resolve_tool_path dynamic detection (#327); set -e-safe increments (#505)

Interactive wizard (pure bash):
- Tools -> Teams -> Review, arrow-key nav, space toggle, a/n all/none,
  live / search, live agent counts, inline OpenCode capacity warning,
  alt-screen takeover with trap-based Ctrl-C restore, non-TTY fallback

#532: installing a subset keeps you under OpenCode's ~119 scanner cap
(upstream anomalyco/opencode#27988); installer warns when exceeded; README
documents it.

New scripts/lib.sh holds shared frontmatter/slug helpers (used by
convert.sh too) + ANSI/TUI primitives.

Closes #157, #216, #233, #327, #426, #487, #505.

Co-Authored-By: kienbui1995 <kienbui1995@users.noreply.github.com>
Co-Authored-By: Shiven0504 <Shiven0504@users.noreply.github.com>
Co-Authored-By: rounakkumarsingh <rounakkumarsingh@users.noreply.github.com>
Co-Authored-By: toukanno <toukanno@users.noreply.github.com>
Co-Authored-By: ilyaivasyk <ilyaivasyk@users.noreply.github.com>
Co-Authored-By: Jason2031 <Jason2031@users.noreply.github.com>
Co-Authored-By: ShaoJiaZhen <ShaoJiaZhen@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -69,6 +69,18 @@ Browse the agents below and copy/adapt the ones you need!
 ./scripts/install.sh --tool codex
 ```
 
+**Install only the teams you need** (not everyone wants all 15 divisions):
+
+```bash
+./scripts/install.sh                                    # interactive wizard: pick tools + teams
+./scripts/install.sh --tool claude-code --division engineering,security
+./scripts/install.sh --tool cursor --agent frontend-developer,ui-designer
+./scripts/install.sh --list teams                       # see every team + agent count
+./scripts/install.sh --tool opencode --division engineering --dry-run
+```
+
+> **OpenCode note:** OpenCode's runtime currently registers only ~119 agents and silently drops the rest ([upstream bug](https://github.com/anomalyco/opencode/issues/27988)). Installing a subset with `--division` keeps you under that limit. The installer warns you when a selection would exceed it.
+
 See the [Multi-Tool Integrations](#-multi-tool-integrations) section below for full details.
 
 ---