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docs: delete eight obsolete planning docs and point the root docs at the live pages #50771

Job	Run time
Lint · scoped · query-options erasure	5m 38s
Type Check · workspace	17m 41s
Lint · ESLint	4m 41s
Lint · scoped · slot lookup & corpus	6m 3s
Lint · docs & code guards	4m 51s
Type Check · consumer gates	7m 36s
Lint · scoped · tooling self-tests	4m 40s
Lint · repo & tooling gates	5m 26s
Type Check · debt ledger	5m 52s
Lint · CI, release & engine gates	5m 13s
Type Check · source gates	4m 26s
Lint · PM dispatch-gates	6m 37s
Lint & Repo Gates	4s
TypeScript Type Check	2s
	1h 18m 50s