Rename dvb-common → broadcast-common + repo → rust-broadcast (v8.1.0)

[fishloa]

Renames the shared base crate dvb-common → broadcast-common and the repo rust-dvb → rust-broadcast. Non-breaking via a deprecated re-export shim.

What changed

• broadcast-common 8.1.0 — content moved verbatim from dvb-common (Parse/Serialize, CRC-32/MPEG-2, BCD, bits, MJD/UTC time, impl_spec_display!).
• dvb-common 8.1.0 — now a deprecated pub use broadcast_common::* shim, so dvb-common = "8" consumers keep building.
• Workspace-wide sweep (432 files): dvb_common → broadcast_common, dep dvb-common → broadcast-common.
• All 23 dvb-common-dependent crates bumped + re-released on broadcast-common (lockstep 8.1.0, mpeg-ts 0.1.1, + 16 independents).
• release.yml: broadcast-common publishes first (no workspace deps), then the dvb-common shim.
• GitHub repo renamed → rust-broadcast; repository= fields updated.

Verification (orchestrator-run, isolated target)

• fmt ✓ · clippy -D warnings ✓ · 143 test suites ✓ · doc -D warnings ✓ · no-default ✓ · thumbv7em no_std ✓
• broadcast-common + dvb-common shim compile; shim re-export preserves type identity.

Release plan (after merge, on explicit OK)

1. Tag v8.1.0 → publishes broadcast-common (new) → dvb-common shim → bbframe → si → conformance → t2mi → tools.
2. 17 independent tags pushed one-at-a-time (mpeg-ts, mpeg-ps, …), each on broadcast-common 8.1.
3. Verify sparse index + docs.rs.

Plan: docs/superpowers/plans/2026-06-29-repo-rename-broadcast-common.md

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