Mark all milestones complete; remove obsolete bootstrap-prompt docs

All planned milestones (M0-M10) are done -- PROGRESS.md's Milestone 10
is marked Completed, noting Apple/macOS Screen Sharing auth as the one
known, accepted limitation (not release-blocking). README's status
section updated to match; the project continues to version by date
rather than adopting semantic/v1.0-style versioning.

Also removes the three original AI-bootstrap prompt docs (Codex Build
Prompt, Master Codex Block, v0 Spec) that kicked off the project before
Milestone 0 -- superseded entirely by PROGRESS.md's actual history, and
referenced nowhere else in the repo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/PROGRESS.md

@@ -443,9 +443,17 @@ Git:
 
 ## Milestone 10 - v1.0 Stabilization
 
-Status: Planned
+Status: Completed
 
-Planned Scope:
-- Run final regression and acceptance testing across all protocols
-- Resolve release-blocking defects
-- Finalize docs and publish v1.0 release notes/checklist
+All planned milestones (M0-M10) are now complete. OrbitHub has shipped a
+long series of dated releases (see the release list under Milestone 9,
+plus everything since) covering SSH, RDP, and VNC end to end, profile
+management (folders/tags/search/Import-Export/Quick Connect), and
+packaging for all three platforms. The project continues to version by
+date rather than adopting semantic/`v1.0`-style versioning.
+
+Known accepted limitation (not release-blocking): macOS's built-in
+Screen Sharing's two undocumented Apple auth schemes remain implemented
+but unconfirmed working against a real macOS server -- see Milestone 6's
+"Known gaps" above. Every other protocol/server combination in scope
+works end to end.