chore(main): release palette 6.0.0

[jmagar]

This release PR is managed by release-please. CI may add a follow-up fixup commit for derived files such as Cargo.lock or Android versionCode.

6.0.0 (2026-07-31)

⚠ BREAKING CHANGES

• artifact-bearing responses return opaque artifact IDs instead of server filesystem paths, and web source options use the canonical headers object shape.

Added

• Successor to #280: unified source pipeline, ledger, command model, and source graph #298: post-smoke followups — scope=page, watch create, mutates_if, presentation tokens (e01592f)
• apps: web token hardening, palette unified job polling, android memory/session client (a17dc86)
• complete #298 closeout wave with structured source progress (320963f)
• complete pipeline unification closeout (c886f35)
• mobile: MobileSession status/source_refs/draft/sync_version + Android entity (#298 WS-I, bead .13) (f3cbf9e)
• palette: Files view split-pane, bulk ingest, AI-edit diff, SFTP browsing (#393) (f88914f)
• palette: GitHub view Feed tab + two-pane split (#394) (b4ae3d9)

Fixed

• address phase 1 review feedback (7781fe5)
• jobs: remove legacy job families (ba0b29b)
• palette: migrate scrape/crawl/embed/ingest onto POST /v1/sources (d74ed35)
• release: repair artifact build contracts (14dc1f1)
• release: sync component versions after release PRs (4d023e7)
• review: close source watch review gaps (d586076)
• web: distinct operation_id for POST /v1/graph/query (#298) (a379a59)

Changed

• split closeout monoliths (9c360f4)

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Merge this PR to let release-please create the tag and GitHub Release. Artifact workflows attach binaries/APKs/zips after the release is created.