Cut the history out of CLAUDE.md

[hacker-cb]

CLAUDE.md instructs; it is not a changelog. Six passages narrated what the repo
used to do rather than what it does, and two had outlived the state they
described — the failure mode #16
was written to fix, arriving from the other direction: not a rule that drifted out
of step with CI, but a rule that was only ever a note about a migration.

Dropped outright

• "There are no -linux-<arch> tags in GHCR any more." True of the workflows
  and false of the registry, which held 51 of them until they were deleted today.
  It read as a statement about what is published, so anyone opening GHCR and seeing
  idf-v5.4.1-linux-amd64 had to decide which source was lying.
• "Publishing is still master-only in the sense that matters…" — said in full
  three bullets above, in the sub-bullet that already splits which tags get
  written from whether the image is uploaded.

Merged

The pull-request validation bullet absorbed the "That works because…" bullet
following it, which restated the push-by-digest rule from the sub-bullet directly
above them both. The one fact only it carried — that a pull request leaves untagged
blobs behind — moved into the surviving bullet.

Trimmed to the rule and its measurement

• The esp-matter timeout no longer recounts the 180-minute figure or the
  337-minute QEMU leg it was set against. The measurement that constrains the
  decision (8–11 minutes native) and the warning not to tighten toward it both stay.
• The verification layer no longer explains that emulation used to be the loudest
  source of silent install failures. The reasons that still apply — a stale mirror,
  an installer exiting 0 on a partial install — stay.
• The cache bullet says there is no cache rather than that the settings "were
  removed", and absorbs the "cold by construction" clause that had been stranded on
  the workflow_dispatch bullet as a dangling reference to it.

Every passage that justifies a rule with a number is untouched; only the narration
is gone. Net −31/+23 lines.

[Copilot]

Pull request overview

This PR refines CLAUDE.md to be purely instructional (rules + rationale) rather than partially historical, removing outdated or redundant narration that could mislead readers about current CI/registry behavior.

Changes:

• Removed obsolete statements (e.g., about -linux-<arch> tags and master-only publishing phrasing that duplicated existing rules).
• Merged/condensed adjacent bullets to keep only the operative rule and still-relevant rationale (e.g., PR digest pushes leaving untagged blobs).
• Trimmed historical measurement backstory while preserving the measurements that still constrain current decisions (timeouts, verification layer rationale, build cache outcome).

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