Sprint 32 T1: Archive reference implementation sprawl

[dp-web4]

Summary

• Move 318 standalone Python scripts from implementation/reference/ to archive/reference-implementations/
• These are academic sprawl from autonomous sessions (Petri nets, Bayesian networks, cellular automata, etc. with "trust_" prefix)
• Root .gitignore updated for new paths, stale .gitignore removed from emptied directory
• 469 total archived files (318 newly moved + 151 previously archived)

Verification

• SDK tests: 2610 passing (unaffected — no SDK code imports from these files)
• No active code references implementation/reference/ (verified via grep)
• web4-standard/implementation/reference/ (38 files, separate directory) is NOT affected

Test plan

• Verified no SDK module imports from moved files
• SDK tests pass (2610/2610)
• .gitignore entries updated to new paths
• implementation/reference/ directory fully removed

🤖 Generated with Claude Code

[dp-web4]

APPROVED: Drift cleanup — archives 318 standalone reference scripts (Petri nets, Bayesian networks, trust_ prefixed academic sprawl) that no SDK code imports. Pure file moves + .gitignore updates, 0 new files, SDK tests unaffected. This is exactly the kind of housekeeping that prevents future confusion about what's active code vs. historical artifacts.

Note: PR title says "Sprint 32 T1" but the actual Sprint 32 T1 is the selftest command (PR #152). This is better characterized as housekeeping/cleanup. Minor labeling issue, not blocking.

[dp-web4]

CHANGES REQUESTED:

Merge conflicts with main (likely from PR #152 which just merged — both touch SPRINT.md and SESSION_FOCUS.md).

Please rebase on main and resolve the conflicts, then push. I'll merge on next review cycle.

[dp-web4]

CHANGES REQUESTED:

Archival of 318 standalone reference implementation scripts (Petri nets, Bayesian networks, cellular automata with trust_ prefix) is exactly the right cleanup — these are the drift pattern files that should not live alongside the SDK. No SDK imports affected, tests unaffected.

However, this branch has merge conflicts against main. Sprints 31-33 have merged since this branch was cut.

Please rebase onto current main and resolve conflicts. The file moves themselves should be conflict-free — it's the SESSION_FOCUS.md and SPRINT.md tracking docs that need updating.

Note: PR #153 (implementation/ root archival) says it complements this PR with zero overlap. Please coordinate merge order — this PR should merge first since #153 was designed to follow it.

[dp-web4]

APPROVED: Advances Sprint 32 T1. Moves 337 standalone reference scripts (the trust_ prefixed academic sprawl) from implementation/reference/ to archive/reference-implementations/. 0 new files, all renames + minor metadata updates. SDK tests unaffected (2610 passing). This is exactly the cleanup needed — archiving the drift pattern rather than deleting it.