v2.0.0

2.0.0: the web installer is tiger-headless

The wizard holds no install logic. build.php inlines the engine from its tagged release
(ENGINE_VERSION) into dist/tiger-install.php — still one file for the user. Screens:
Requirements (engine hostRequirements) → Location → Details (database + admin, one form; the
engine validates the spec and proves the database before anything is written) → Install (one
engine hop per request, progress on screen, resume from any failure, manual upload after a
download failure) → Done (self-delete). The spec lives in a 0600 job file above the docroot;
the database password never rides in a hidden field. Invariants enforce all of it.

Proven on host3 (authors account, symlink off): wrong password refused before writing; four
hops; a failure mid-way resumed from that step after the engine fix; self-deleted; site live.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L8p9pLJ3DFstG3xZuh2QgZ