docs: reconcile the changelog with what has actually shipped

[TheGupta2012]

The Unreleased section had drifted in both directions: five dependency PRs merged after v1.0.4 were never recorded, and fourteen entries describing already-released work were never cleared. The next release notes would have both omitted the former and re-announced the latter.

Added the missing entries

Five dependency PRs merged after the v1.0.4 tag with no changelog entry:

PR	Change
#319	docutils <0.23 → <0.24
#321	codecov/codecov-action 6.0.0 → 7.0.0
#323	actions/checkout 6 → 7
#324	pillow <12.3.0 → <12.4.0
#328	actions/setup-python 6 → 7

Removed the released entries

• v1.0.3 (tagged 2026-04-09) — Fix classical register visibility inside box scope #306, plus dependency bumps Bump actions/configure-pages from 5 to 6 #307, Bump codecov/codecov-action from 5.5.2 to 6.0.0 #308, Bump actions/deploy-pages from 4 to 5 #309, Update pillow requirement from <12.2.0 to <12.3.0 #310
• v1.0.4 (tagged 2026-07-15) — fix: dt duration unit incorrectly mapped to ns (#301) #317, Add c3x and rc3x gates, fix broken c4x, extend ctrl chain #320 (one Added + three Fixed), fix: preserve physical qubits in reset statements #325 (one Improved + two Fixed), and the manylinux build-container migration

The manylinux entry carried no PR link; it traces to 13a1b0b (#326, merged 2026-07-12), an ancestor of the v1.0.4 tag. Worth noting the stale #310 pillow entry sat directly above the #324 one that supersedes it.

v1.0.4 and v1.0.3 now head the Past Release Notes list, which previously stopped at v1.0.2.

Verification

Every one of the 22 PRs merged since v1.0.4 now maps to an entry, and none of the released PRs remain. The check accounts for entries filed under the issue number rather than the PR — #357→#350, #358→#351, #359→#352, #360→#354, #361→#356, #362→#353, #335→#333.

Unreleased now holds only post-v1.0.4 work: 1 Added, 3 Improved/Modified, 14 Fixed, 5 Dependencies. The breaking TypeError on unknown loads() kwargs is consistent with the 1.1.0 minor bump rather than a patch.

Documentation only — no source or test changes. The version bump itself is not part of this PR. Commit carries [no ci], since a changelog-only edit has nothing for the matrix to test.

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